DEP: move pkg_resources back inline in function (delayed import)
xref https://github.com/pandas-dev/pandas/issues/40169#issuecomment-860900794, fixup of  #41503
> we should just say setuptools is an actual dependency, which it is .

It is not. It has never been, until #41503 accidentally made it so nope it was always a dep just u declared 

-1 on this PE Of course it was always a "dependency", but there is a difference between "optional" and "required" dependencies. We have lots of optional dependencies that are not declared in `install_requires` Apart from the "required dependency or not" discussion (-> let's have that in https://github.com/pandas-dev/pandas/issues/41815, since this PR doesn't actually address that), there is also an "import time" reason for merging this PR. 

Importing `pkg_resources` is quite expensive, and doing it at import time of pandas (while it's only needed when plotting with a custom backend) would add something like 20-30% to pandas import time.

---

<details>
<summary>
Tested with <code>python -X importtime -c "import pandas, pkg_resources"</code> in an environment with released pandas 1.2 (which doesn't import pkg_resources). The results of a single run pasted below: importing pandas takes 393 ms, importing pkg_resouces an additional 91ms, which would give an increase of 23%. Those numbers are quite variable though, but based on repeating it a few times, it was always between 20-30%. 
</summary>

```
$ python -X importtime -c "import pandas, pkg_resources"
import time: self [us] | cumulative | imported package
import time:       540 |        540 | _frozen_importlib_external
import time:       147 |        147 |   time
import time:       236 |        383 | zipimport
import time:        59 |         59 |     _codecs
import time:       485 |        544 |   codecs
import time:       572 |        572 |   encodings.aliases
import time:       617 |       1732 | encodings
import time:       315 |        315 | encodings.utf_8
import time:       147 |        147 | _signal
import time:       450 |        450 | encodings.latin_1
import time:        64 |         64 |     _abc
import time:       346 |        410 |   abc
import time:       395 |        805 | io
import time:        87 |         87 |       _stat
import time:       366 |        452 |     stat
import time:      1217 |       1217 |     _collections_abc
import time:       177 |        177 |       genericpath
import time:       280 |        456 |     posixpath
import time:       799 |       2924 |   os
import time:       232 |        232 |   _sitebuiltins
import time:        80 |         80 |     _locale
import time:       145 |        225 |   _bootlocale
import time:       329 |        329 |   types
import time:       264 |        264 |       warnings
import time:       195 |        458 |     importlib
import time:       137 |        137 |       importlib.machinery
import time:       502 |        638 |     importlib.abc
import time:        84 |         84 |           _operator
import time:       324 |        408 |         operator
import time:       142 |        142 |         keyword
import time:       633 |        633 |           _heapq
import time:       160 |        792 |         heapq
import time:        92 |         92 |         itertools
import time:       196 |        196 |         reprlib
import time:      1115 |       1115 |         _collections
import time:       902 |       3644 |       collections
import time:        60 |         60 |         _functools
import time:       629 |        689 |       functools
import time:       641 |       4972 |     contextlib
import time:       448 |       6515 |   importlib.util
import time:        65 |         65 |   sitecustomize
import time:        49 |         49 |   usercustomize
import time:      1566 |      11901 | site
import time:       300 |        300 |     numpy._globals
import time:       176 |        176 |     numpy.__config__
import time:       154 |        154 |     numpy.version
import time:       132 |        132 |     numpy._distributor_init
import time:       809 |        809 |               enum
import time:        71 |         71 |                 _sre
import time:       370 |        370 |                   sre_constants
import time:       349 |        718 |                 sre_parse
import time:       280 |       1068 |               sre_compile
import time:       181 |        181 |               copyreg
import time:       525 |       2581 |             re
import time:      1298 |       3878 |           textwrap
import time:       715 |        715 |               math
import time:       974 |        974 |               _datetime
import time:      1324 |       3012 |             datetime
import time:      7374 |      10385 |           numpy.core._multiarray_umath
import time:       249 |        249 |               numpy.compat._inspect
import time:       211 |        211 |                   fnmatch
import time:       105 |        105 |                     nt
import time:        88 |         88 |                     nt
import time:        84 |         84 |                     nt
import time:        87 |         87 |                     nt
import time:       320 |        681 |                   ntpath
import time:        91 |         91 |                   errno
import time:       176 |        176 |                     urllib
import time:      3933 |       4108 |                   urllib.parse
import time:      1141 |       6230 |                 pathlib
import time:       141 |        141 |                 pickle5
import time:       540 |        540 |                     _struct
import time:       180 |        720 |                   struct
import time:       479 |        479 |                   _compat_pickle
import time:       676 |        676 |                   _pickle
import time:       113 |        113 |                       org
import time:        30 |        143 |                     org.python
import time:        27 |        169 |                   org.python.core
import time:      1228 |       3270 |                 pickle
import time:       257 |       9897 |               numpy.compat.py3k
import time:       332 |      10476 |             numpy.compat
import time:        42 |      10517 |           numpy.compat._inspect
import time:      1307 |      26086 |         numpy.core.overrides
import time:      3264 |      29349 |       numpy.core.multiarray
import time:       358 |        358 |       numpy.core.umath
import time:      1364 |       1364 |         numbers
import time:       196 |        196 |         numpy.core._string_helpers
import time:       218 |        218 |           numpy.core._dtype
import time:       420 |        637 |         numpy.core._type_aliases
import time:       419 |       2616 |       numpy.core.numerictypes
import time:       627 |        627 |           numpy.core._asarray
import time:       391 |        391 |               numpy.core._exceptions
import time:       276 |        666 |             numpy.core._methods
import time:      3566 |       4232 |           numpy.core.fromnumeric
import time:      7629 |      12487 |         numpy.core.shape_base
import time:       175 |        175 |           collections.abc
import time:       312 |        486 |         numpy.core._ufunc_config
import time:       939 |        939 |         numpy.core.arrayprint
import time:      3558 |      17469 |       numpy.core.numeric
import time:      3399 |       3399 |       numpy.core.defchararray
import time:       492 |        492 |       numpy.core.records
import time:       199 |        199 |       numpy.core.memmap
import time:       469 |        469 |       numpy.core.function_base
import time:       177 |        177 |       numpy.core.machar
import time:       360 |        360 |       numpy.core.getlimits
import time:       408 |        408 |       numpy.core.einsumfunc
import time:       657 |        657 |         numpy.core._multiarray_tests
import time:      4383 |       5039 |       numpy.core._add_newdocs
import time:       495 |        495 |       numpy.core._add_newdocs_scalars
import time:       145 |        145 |       numpy.core._dtype_ctypes
import time:       166 |        166 |           _ast
import time:       442 |        608 |         ast
import time:      2584 |       2584 |         platform
import time:      6276 |       6276 |           _ctypes
import time:       315 |        315 |           ctypes._endian
import time:      1162 |       7753 |         ctypes
import time:       946 |      11889 |       numpy.core._internal
import time:       167 |        167 |       numpy._pytesttester
import time:      6655 |      79677 |     numpy.core
import time:       267 |        267 |       numpy.lib.mixins
import time:       544 |        544 |           numpy.lib.ufunclike
import time:      1076 |       1619 |         numpy.lib.type_check
import time:       739 |       2357 |       numpy.lib.scimath
import time:      1057 |       1057 |                 numpy.lib.twodim_base
import time:      7972 |       7972 |                 numpy.linalg.lapack_lite
import time:       736 |        736 |                 numpy.linalg._umath_linalg
import time:      2171 |      11933 |               numpy.linalg.linalg
import time:       151 |      12084 |             numpy.linalg
import time:       316 |      12399 |           numpy.matrixlib.defmatrix
import time:       144 |      12542 |         numpy.matrixlib
import time:       491 |        491 |           numpy.lib.histograms
import time:      2740 |       3230 |         numpy.lib.function_base
import time:       538 |        538 |         numpy.lib.stride_tricks
import time:       644 |      16953 |       numpy.lib.index_tricks
import time:      1474 |       1474 |       numpy.lib.nanfunctions
import time:      1179 |       1179 |       numpy.lib.shape_base
import time:     11458 |      11458 |       numpy.lib.polynomial
import time:       755 |        755 |       numpy.lib.utils
import time:       742 |        742 |       numpy.lib.arraysetops
import time:       214 |        214 |           _weakrefset
import time:       432 |        645 |         weakref
import time:       227 |        227 |         numpy.lib.format
import time:      1267 |       1267 |             zlib
import time:       240 |        240 |               _compression
import time:       615 |        615 |               threading
import time:       426 |        426 |               _bz2
import time:      1442 |       2721 |             bz2
import time:       898 |        898 |               _lzma
import time:       345 |       1242 |             lzma
import time:        59 |         59 |             pwd
import time:       401 |        401 |             grp
import time:      1245 |       6933 |           shutil
import time:       696 |       7628 |         numpy.lib._datasource
import time:       404 |        404 |         numpy.lib._iotools
import time:      6901 |      15803 |       numpy.lib.npyio
import time:       295 |        295 |       numpy.lib.arrayterator
import time:       459 |        459 |       numpy.lib.arraypad
import time:       234 |        234 |       numpy.lib._version
import time:      2403 |      54374 |     numpy.lib
import time:      1017 |       1017 |         numpy.fft._pocketfft_internal
import time:      1664 |       2680 |       numpy.fft._pocketfft
import time:       493 |        493 |       numpy.fft.helper
import time:       263 |       3435 |     numpy.fft
import time:       428 |        428 |         numpy.polynomial.polyutils
import time:       373 |        373 |         numpy.polynomial._polybase
import time:       442 |       1242 |       numpy.polynomial.polynomial
import time:       352 |        352 |       numpy.polynomial.chebyshev
import time:       370 |        370 |       numpy.polynomial.legendre
import time:       315 |        315 |       numpy.polynomial.hermite
import time:       320 |        320 |       numpy.polynomial.hermite_e
import time:       268 |        268 |       numpy.polynomial.laguerre
import time:       583 |       3448 |     numpy.polynomial
import time:        88 |         88 |               backports_abc
import time:      1014 |       1101 |             numpy.random._common
import time:       551 |        551 |                 binascii
import time:       236 |        787 |               base64
import time:      1962 |       1962 |                 _hashlib
import time:       294 |        294 |                   _blake2
import time:       301 |        301 |                   _sha3
import time:       214 |        808 |                 hashlib
import time:       230 |       3000 |               hmac
import time:       292 |        292 |                   _bisect
import time:       107 |        398 |                 bisect
import time:       281 |        281 |                 _sha512
import time:       365 |        365 |                 _random
import time:       315 |       1357 |               random
import time:       174 |       5316 |             secrets
import time:       857 |       7274 |           numpy.random.bit_generator
import time:       428 |        428 |           numpy.random._bounded_integers
import time:       308 |        308 |           numpy.random._mt19937
import time:      1385 |       9393 |         numpy.random.mtrand
import time:       274 |        274 |         numpy.random._philox
import time:       242 |        242 |         numpy.random._pcg64
import time:       292 |        292 |         numpy.random._sfc64
import time:       778 |        778 |         numpy.random._generator
import time:       223 |      11199 |       numpy.random._pickle
import time:       223 |      11422 |     numpy.random
import time:       355 |        355 |     numpy.ctypeslib
import time:       314 |        314 |               _opcode
import time:       522 |        836 |             opcode
import time:       374 |       1209 |           dis
import time:       134 |        134 |               token
import time:       768 |        902 |             tokenize
import time:       131 |       1033 |           linecache
import time:      2433 |       4674 |         inspect
import time:      2983 |       7657 |       numpy.ma.core
import time:      1528 |       1528 |       numpy.ma.extras
import time:       299 |       9483 |     numpy.ma
import time:      2535 |     165485 |   numpy
import time:       331 |        331 |     pytz.exceptions
import time:       374 |        374 |     pytz.lazy
import time:       700 |        700 |     pytz.tzinfo
import time:       304 |        304 |     pytz.tzfile
import time:      1020 |       2726 |   pytz
import time:       200 |        200 |     dateutil._version
import time:       275 |        474 |   dateutil
import time:       673 |        673 |         mmap
import time:      2400 |       2400 |         typing
import time:      2413 |       5485 |       pandas._typing
import time:       397 |       5882 |     pandas.compat
import time:       219 |        219 |       distutils
import time:       959 |       1177 |     distutils.version
import time:       545 |       7603 |   pandas.compat.numpy
import time:      1107 |       1107 |               pandas._libs.tslibs.dtypes
import time:       369 |        369 |                 pandas._libs.tslibs.base
import time:       459 |        459 |                   pandas._libs.tslibs.np_datetime
import time:       957 |       1416 |                 pandas._libs.tslibs.nattype
import time:       197 |        197 |                         __future__
import time:      1059 |       1255 |                       six
import time:        47 |         47 |                       six.moves
import time:       294 |        294 |                       dateutil.tz._common
import time:       296 |        296 |                       dateutil.tz._factories
import time:        48 |         48 |                         six.moves.winreg
import time:       323 |        370 |                       dateutil.tz.win
import time:      1192 |       3451 |                     dateutil.tz.tz
import time:       279 |       3730 |                   dateutil.tz
import time:       666 |       4395 |                 pandas._libs.tslibs.timezones
import time:       561 |        561 |                   pandas._libs.tslibs.ccalendar
import time:      1253 |       1814 |                 pandas._libs.tslibs.tzconversion
import time:      1459 |       1459 |                     pandas._libs.tslibs.timedeltas
import time:       154 |        154 |                       backports_abc
import time:      1287 |       1287 |                         locale
import time:      1546 |       1546 |                             pandas._config.config
import time:       518 |        518 |                             pandas._config.dates
import time:       282 |        282 |                             pandas._config.display
import time:       372 |       2717 |                           pandas._config
import time:      1425 |       1425 |                             signal
import time:       158 |        158 |                             msvcrt
import time:       650 |        650 |                             _posixsubprocess
import time:       854 |        854 |                             select
import time:      1409 |       1409 |                             selectors
import time:       909 |       5402 |                           subprocess
import time:       290 |       8408 |                         pandas._config.localization
import time:       126 |        126 |                           backports_abc
import time:       787 |        787 |                           calendar
import time:      2098 |       3010 |                         pandas._libs.tslibs.strptime
import time:      2016 |      14719 |                       pandas._libs.tslibs.fields
import time:      1795 |      16667 |                     pandas._libs.tslibs.timestamps
import time:       194 |        194 |                     backports_abc
import time:       294 |        294 |                     dateutil.easter
import time:       265 |        265 |                       dateutil._common
import time:       431 |        695 |                     dateutil.relativedelta
import time:       570 |        570 |                     pandas._libs.properties
import time:      2984 |      22860 |                   pandas._libs.tslibs.offsets
import time:       169 |        169 |                   backports_abc
import time:        76 |         76 |                         _string
import time:      1493 |       1568 |                       string
import time:      1512 |       1512 |                         _decimal
import time:       270 |       1782 |                       decimal
import time:      1213 |       4562 |                     dateutil.parser._parser
import time:       612 |        612 |                     dateutil.parser.isoparser
import time:       567 |       5741 |                   dateutil.parser
import time:      1332 |      30100 |                 pandas._libs.tslibs.parsing
import time:       994 |      39085 |               pandas._libs.tslibs.conversion
import time:      1272 |       1272 |               pandas._libs.tslibs.period
import time:       832 |        832 |               pandas._libs.tslibs.vectorized
import time:       417 |      42711 |             pandas._libs.tslibs
import time:        38 |      42748 |           pandas._libs.tslibs.nattype
import time:       499 |        499 |           pandas._libs.ops_dispatch
import time:       886 |      44132 |         pandas._libs.missing
import time:      1405 |      45537 |       pandas._libs.hashtable
import time:      1395 |       1395 |       pandas._libs.algos
import time:      1448 |      48379 |     pandas._libs.interval
import time:       232 |      48610 |   pandas._libs
import time:       830 |        830 |     pandas._libs.tslib
import time:      1860 |       2690 |   pandas._libs.lib
import time:       279 |        279 |     pandas.core
import time:      1154 |       1432 |   pandas.core.config_init
import time:       168 |        168 |       pandas.core.dtypes
import time:       406 |        406 |         pandas.errors
import time:       647 |        647 |         pandas.core.dtypes.generic
import time:       658 |       1710 |       pandas.core.dtypes.base
import time:       394 |        394 |       pandas.core.dtypes.inference
import time:      2137 |       4407 |     pandas.core.dtypes.dtypes
import time:       543 |        543 |       pandas.core.dtypes.common
import time:       492 |       1034 |     pandas.core.dtypes.missing
import time:       806 |        806 |           pandas.util._decorators
import time:       171 |        171 |             pandas.core.util
import time:       631 |        631 |             pandas._libs.hashing
import time:       337 |       1139 |           pandas.core.util.hashing
import time:       213 |       2156 |         pandas.util
import time:        30 |       2186 |       pandas.util._decorators
import time:       466 |        466 |         pandas.util._validators
import time:       872 |       1337 |       pandas.core.dtypes.cast
import time:       547 |        547 |         pandas.core.common
import time:       330 |        877 |       pandas.core.construction
import time:       243 |        243 |       pandas.core.indexers
import time:       963 |       5604 |     pandas.core.algorithms
import time:       706 |        706 |         pandas.compat.numpy.function
import time:       699 |        699 |             pandas._libs.ops
import time:       152 |        152 |               pandas.core.ops.roperator
import time:       184 |        335 |             pandas.core.ops.missing
import time:       134 |        134 |             pandas.core.ops.dispatch
import time:       134 |        134 |             pandas.core.ops.invalid
import time:       367 |       1669 |           pandas.core.ops.array_ops
import time:       181 |        181 |           pandas.core.ops.common
import time:       365 |        365 |           pandas.core.ops.docstrings
import time:       217 |        217 |           pandas.core.ops.mask_ops
import time:       182 |        182 |           pandas.core.ops.methods
import time:       414 |       3025 |         pandas.core.ops
import time:       178 |        178 |           pandas.compat._optional
import time:       309 |        487 |         pandas.core.missing
import time:       654 |        654 |         pandas.core.sorting
import time:      1808 |       6678 |       pandas.core.arrays.base
import time:      1340 |       1340 |           pandas.core.nanops
import time:       181 |        181 |           pandas.core.array_algos
import time:       230 |        230 |           pandas.core.array_algos.masked_reductions
import time:       382 |        382 |           pandas.core.arraylike
import time:       680 |       2810 |         pandas.core.arrays.masked
import time:       492 |       3302 |       pandas.core.arrays.boolean
import time:       665 |        665 |           _csv
import time:       423 |       1088 |         csv
import time:       464 |        464 |         pandas.core.accessor
import time:       148 |        148 |           pandas.core.array_algos.transforms
import time:       606 |        753 |         pandas.core.arrays._mixins
import time:      1032 |       1032 |         pandas.core.base
import time:      3105 |       3105 |             pandas.core.strings.accessor
import time:       377 |        377 |             pandas.core.strings.base
import time:       211 |       3692 |           pandas.core.strings
import time:       680 |        680 |           unicodedata
import time:       576 |       4948 |         pandas.core.strings.object_array
import time:       198 |        198 |           pandas.io
import time:       236 |        434 |         pandas.io.formats
import time:       234 |        234 |         pandas.io.formats.console
import time:      1314 |      10264 |       pandas.core.arrays.categorical
import time:       237 |        237 |           pandas.tseries
import time:       530 |        530 |           pandas.tseries.frequencies
import time:      1645 |       2411 |         pandas.core.arrays.datetimelike
import time:       285 |        285 |         pandas.core.arrays._ranges
import time:       200 |        200 |         pandas.tseries.offsets
import time:      1140 |       4035 |       pandas.core.arrays.datetimes
import time:       178 |        178 |           pandas.core.tools
import time:       262 |        440 |         pandas.core.tools.numeric
import time:       195 |        195 |         pandas.core.arrays.numeric
import time:       681 |       1315 |       pandas.core.arrays.floating
import time:       786 |        786 |       pandas.core.arrays.integer
import time:       174 |        174 |           pandas.core.indexes
import time:        99 |         99 |                 org
import time:        24 |        123 |               org.python
import time:        22 |        145 |             org.python.core
import time:       273 |        418 |           copy
import time:      1989 |       1989 |           pandas._libs.index
import time:      1173 |       1173 |           pandas._libs.join
import time:       788 |        788 |                   pandas._libs.sparse
import time:       435 |        435 |                   pandas.core.arrays.sparse.dtype
import time:       623 |        623 |                   pandas.io.formats.printing
import time:       867 |       2711 |                 pandas.core.arrays.sparse.array
import time:       383 |       3094 |               pandas.core.arrays.sparse.accessor
import time:       191 |       3284 |             pandas.core.arrays.sparse
import time:       326 |       3609 |           pandas.core.dtypes.concat
import time:       230 |        230 |           pandas.core.indexes.frozen
import time:      2270 |       9861 |         pandas.core.indexes.base
import time:      1601 |      11461 |       pandas.core.arrays.interval
import time:       683 |        683 |       pandas.core.arrays.numpy_
import time:       766 |        766 |       pandas.core.arrays.period
import time:       433 |        433 |       pandas.core.arrays.string_
import time:       630 |        630 |       pandas.core.arrays.timedeltas
import time:       443 |      40792 |     pandas.core.arrays
import time:       190 |        190 |     pandas.core.flags
import time:       931 |        931 |         pandas._libs.reduction
import time:       728 |        728 |               pandas.core.indexes.extension
import time:      1013 |       1741 |             pandas.core.indexes.category
import time:       724 |        724 |                 pandas.core.indexes.numeric
import time:       191 |        191 |                 pandas.core.tools.timedeltas
import time:      1160 |       2074 |               pandas.core.indexes.datetimelike
import time:       185 |        185 |               pandas.core.tools.times
import time:      1254 |       3512 |             pandas.core.indexes.datetimes
import time:       194 |        194 |               pandas.util._exceptions
import time:      2121 |       2121 |               pandas.core.indexes.multi
import time:       466 |        466 |               pandas.core.indexes.timedeltas
import time:      1749 |       4528 |             pandas.core.indexes.interval
import time:       972 |        972 |             pandas.core.indexes.period
import time:       911 |        911 |             pandas.core.indexes.range
import time:       339 |      11999 |           pandas.core.indexes.api
import time:       713 |      12712 |         pandas.core.aggregation
import time:        98 |         98 |             gc
import time:       499 |        499 |                   _json
import time:       517 |       1015 |                 json.scanner
import time:       531 |       1546 |               json.decoder
import time:       567 |        567 |               json.encoder
import time:       344 |       2456 |             json
import time:       414 |        414 |               pandas._libs.indexing
import time:      1816 |       2230 |             pandas.core.indexing
import time:       135 |        135 |                   backports_abc
import time:       915 |       1050 |                 pandas._libs.internals
import time:       560 |        560 |                 pandas._libs.writers
import time:       424 |        424 |                 pandas.core.array_algos.replace
import time:      2037 |       4069 |               pandas.core.internals.blocks
import time:       521 |        521 |                   pandas.core.internals.ops
import time:       863 |       1384 |                 pandas.core.internals.managers
import time:       606 |       1989 |               pandas.core.internals.concat
import time:       280 |       6338 |             pandas.core.internals
import time:       152 |        152 |             pandas.core.shared_docs
import time:       133 |        133 |                   pandas._libs.window
import time:      2515 |       2648 |                 pandas._libs.window.aggregations
import time:       374 |        374 |                 pandas.core.util.numba_
import time:       205 |        205 |                 pandas.core.window.common
import time:       501 |        501 |                   pandas._libs.window.indexers
import time:       688 |       1189 |                 pandas.core.window.indexers
import time:       217 |        217 |                 pandas.core.window.numba_
import time:       447 |        447 |                   pandas.core.groupby.base
import time:      3263 |       3710 |                 pandas.core.window.rolling
import time:       927 |       9266 |               pandas.core.window.ewm
import time:      1228 |       1228 |               pandas.core.window.expanding
import time:       180 |      10673 |             pandas.core.window
import time:       173 |        173 |                 pandas.core.reshape
import time:       607 |        780 |               pandas.core.reshape.concat
import time:       813 |        813 |                 dataclasses
import time:       407 |        407 |                 gzip
import time:       903 |        903 |                 zipfile
import time:      1525 |       3647 |               pandas.io.common
import time:      2155 |       6581 |             pandas.io.formats.format
import time:      6759 |      35281 |           pandas.core.generic
import time:       571 |        571 |           pandas.core.internals.construction
import time:       133 |        133 |             pandas.core.reshape.util
import time:       371 |        503 |           pandas.core.reshape.melt
import time:       703 |        703 |             pandas._libs.reshape
import time:       713 |        713 |             pandas.core.indexes.accessors
import time:       249 |        249 |               pandas.arrays
import time:       798 |       1046 |             pandas.core.tools.datetimes
import time:      1975 |       1975 |               pandas.plotting._core
import time:       325 |        325 |               pandas.plotting._misc
import time:       222 |       2521 |             pandas.plotting
import time:      4529 |       9512 |           pandas.core.series
import time:       931 |        931 |           pandas.io.formats.info
import time:      7873 |      54668 |         pandas.core.frame
import time:       882 |        882 |           pandas._libs.groupby
import time:       311 |        311 |           pandas.core.groupby.numba_
import time:       201 |        201 |               pandas.core.groupby.categorical
import time:       448 |        649 |             pandas.core.groupby.grouper
import time:       786 |       1434 |           pandas.core.groupby.ops
import time:      2917 |       5543 |         pandas.core.groupby.groupby
import time:      2310 |      76162 |       pandas.core.groupby.generic
import time:       188 |      76350 |     pandas.core.groupby
import time:       366 |     128741 |   pandas.core.api
import time:       202 |        202 |   pandas.tseries.api
import time:       139 |        139 |     pandas.core.computation
import time:       134 |        134 |           pandas.core.computation.common
import time:       218 |        351 |         pandas.core.computation.align
import time:       567 |        567 |             pprint
import time:       270 |        270 |             pandas.compat.chainmap
import time:       288 |       1124 |           pandas.core.computation.scope
import time:       571 |       1694 |         pandas.core.computation.ops
import time:       288 |       2333 |       pandas.core.computation.engines
import time:       250 |        250 |         pandas.core.computation.parsing
import time:      1486 |       1735 |       pandas.core.computation.expr
import time:       211 |       4278 |     pandas.core.computation.eval
import time:       171 |       4586 |   pandas.core.computation.api
import time:      1048 |       1048 |     pandas.core.reshape.merge
import time:       927 |        927 |     pandas.core.reshape.pivot
import time:       380 |        380 |     pandas.core.reshape.reshape
import time:       224 |        224 |     pandas.core.reshape.tile
import time:       236 |       2813 |   pandas.core.reshape.api
import time:       187 |        187 |     pandas.api.extensions
import time:       122 |        122 |     pandas.api.indexers
import time:       232 |        232 |       pandas.core.dtypes.api
import time:       136 |        367 |     pandas.api.types
import time:       199 |        874 |   pandas.api
import time:       235 |        235 |   pandas.util._print_versions
import time:       125 |        125 |     pandas.io.clipboards
import time:        97 |         97 |           backports_abc
import time:       976 |       1072 |         pandas._libs.parsers
import time:       166 |        166 |         pandas.io.excel._util
import time:       148 |        148 |           pandas.io.date_converters
import time:      1928 |       2075 |         pandas.io.parsers
import time:       279 |        279 |         pandas.io.excel._odfreader
import time:      1566 |       1566 |         pandas.io.excel._openpyxl
import time:       215 |        215 |         pandas.io.excel._pyxlsb
import time:       186 |        186 |         pandas.io.excel._xlrd
import time:      1065 |       6622 |       pandas.io.excel._base
import time:       437 |        437 |         pandas._libs.json
import time:       175 |        175 |           pandas.io.formats._color_data
import time:       297 |        297 |           pandas.io.formats.css
import time:      1524 |       1995 |         pandas.io.formats.excel
import time:       315 |       2747 |       pandas.io.excel._odswriter
import time:       308 |        308 |       pandas.io.excel._xlsxwriter
import time:       185 |        185 |       pandas.io.excel._xlwt
import time:       173 |      10033 |     pandas.io.excel
import time:       251 |        251 |     pandas.io.feather_format
import time:       207 |        207 |     pandas.io.gbq
import time:       873 |        873 |     pandas.io.html
import time:       741 |        741 |         pandas.io.json._normalize
import time:       230 |        230 |         pandas.io.json._table_schema
import time:      1251 |       2220 |       pandas.io.json._json
import time:       192 |       2412 |     pandas.io.json
import time:       145 |        145 |     pandas.io.orc
import time:       473 |        473 |     pandas.io.parquet
import time:       240 |        240 |       pandas.compat.pickle_compat
import time:       366 |        606 |     pandas.io.pickle
import time:       607 |        607 |       pandas.core.computation.pytables
import time:      2484 |       3091 |     pandas.io.pytables
import time:       291 |        291 |       pandas.io.sas.sasreader
import time:       188 |        478 |     pandas.io.sas
import time:       171 |        171 |     pandas.io.spss
import time:       768 |        768 |     pandas.io.sql
import time:      2073 |       2073 |     pandas.io.stata
import time:       282 |      21982 |   pandas.io.api
import time:       211 |        211 |   pandas.util._tester
import time:       457 |        457 |       tempfile
import time:       468 |        468 |         cmath
import time:       468 |        936 |       pandas._libs.testing
import time:      1491 |       2882 |     pandas._testing
import time:       145 |       3027 |   pandas.testing
import time:       248 |        248 |   pandas._version
import time:      1004 |     392933 | pandas
import time:       812 |        812 |   pkgutil
import time:       197 |        197 |         xml
import time:       217 |        414 |       xml.parsers
import time:       735 |        735 |       pyexpat
import time:       183 |       1331 |     xml.parsers.expat
import time:      1224 |       2555 |   plistlib
import time:       272 |        272 |     email
import time:       455 |        455 |       email.errors
import time:       266 |        266 |           email.quoprimime
import time:       133 |        133 |           email.base64mime
import time:       164 |        164 |               quopri
import time:       129 |        292 |             email.encoders
import time:      1235 |       1526 |           email.charset
import time:      1026 |       2951 |         email.header
import time:       762 |        762 |             _socket
import time:      1813 |       2575 |           socket
import time:       290 |        290 |           email._parseaddr
import time:     12908 |      15772 |         email.utils
import time:       377 |      19099 |       email._policybase
import time:       791 |      20343 |     email.feedparser
import time:       345 |      20959 |   email.parser
import time:       344 |        344 |   pkg_resources.extern
import time:       132 |        132 |       pkg_resources._vendor
import time:      1122 |       1254 |     pkg_resources._vendor.six
import time:       142 |       1395 |   pkg_resources.extern.six
import time:        43 |         43 |     pkg_resources._vendor.six.moves
import time:        95 |        138 |   pkg_resources.extern.six.moves
import time:       299 |        299 |     pkg_resources._vendor.appdirs
import time:        90 |        388 |   pkg_resources.extern.appdirs
import time:       180 |        180 |       pkg_resources._vendor.packaging.__about__
import time:       209 |        389 |     pkg_resources._vendor.packaging
import time:        80 |        469 |   pkg_resources.extern.packaging
import time:       170 |        170 |     pkg_resources.extern.packaging._structures
import time:       123 |        123 |     pkg_resources.extern.packaging._typing
import time:      2818 |       3111 |   pkg_resources.extern.packaging.version
import time:       152 |        152 |     pkg_resources.extern.packaging._compat
import time:       236 |        236 |     pkg_resources.extern.packaging.utils
import time:      5376 |       5763 |   pkg_resources.extern.packaging.specifiers
import time:       431 |        431 |         traceback
import time:     13278 |      13708 |       pkg_resources._vendor.pyparsing
import time:       102 |      13809 |     pkg_resources.extern.pyparsing
import time:        41 |         41 |       pkg_resources._vendor.six.moves.urllib
import time:        75 |        115 |     pkg_resources.extern.six.moves.urllib
import time:      1302 |       1302 |     pkg_resources.extern.packaging.markers
import time:      9067 |      24292 |   pkg_resources.extern.packaging.requirements
import time:       729 |        729 |   sysconfig
import time:     30516 |      91462 | pkg_resources
```

</details> ok the delayed import is fine (as understand the total import issue), however we still need to declare this dependency. fine. can we also pls add to our build deps. @meeseeksdev backport 1.3.x Something went wrong ... Please have  a look at my logs.