BF: Skip test_read_excel_parse_dates if no xlwt which is used in to_excel
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=h1) Report
> Merging [#19803](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/740ad9aabda113e34de0d30c78b8aec40414daf7?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19803/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19803      +/-   ##
==========================================
- Coverage   91.61%    91.6%   -0.01%     
==========================================
  Files         150      150              
  Lines       48887    48887              
==========================================
- Hits        44786    44784       -2     
- Misses       4101     4103       +2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.98% <ø> (-0.01%)` | :arrow_down: |
| #single | `41.8% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/19803/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `83.64% <0%> (-0.21%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=footer). Last update [740ad9a...dd910d5](https://codecov.io/gh/pandas-dev/pandas/pull/19803?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 FWIW the `_skip_if_no_*` methods in `test_excel.py` could all be replaced with the `skip_if_no` decorator that was introduced in #18765

```python
import pandas.util._test_decorators as td

@td.skip_if_no('xlwt')
def foo(self):
  ...

@td.skip_if_no('xlrd', min_version='0.9')
def bar(self):
  ...
```

 thanks @yarikoptic 

@WillAyd yep good suggestion. can you open an issue (and PR even better!) for this.