BLD: Suppressing errors while compling pandas/_libs/groupby
- [x] ref #32163
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

This are the errors that this PR is getting rid of:

```
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_116group_last’:
pandas/_libs/groupby.c:37458:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
37458 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_118group_last’:
pandas/_libs/groupby.c:38233:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
38233 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_120group_last’:
pandas/_libs/groupby.c:39008:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
39008 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_122group_last’:
pandas/_libs/groupby.c:39781:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
39781 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_124group_last’:
pandas/_libs/groupby.c:40563:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
40563 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_128group_nth’:
pandas/_libs/groupby.c:41999:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
41999 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_130group_nth’:
pandas/_libs/groupby.c:42820:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
42820 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_132group_nth’:
pandas/_libs/groupby.c:43641:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
43641 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_134group_nth’:
pandas/_libs/groupby.c:44460:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
44460 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_136group_nth’:
pandas/_libs/groupby.c:45288:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
45288 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_152group_max’:
pandas/_libs/groupby.c:55168:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
55168 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_154group_max’:
pandas/_libs/groupby.c:55970:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
55970 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_156group_max’:
pandas/_libs/groupby.c:56772:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
56772 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_158group_max’:
pandas/_libs/groupby.c:57568:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
57568 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_162group_min’:
pandas/_libs/groupby.c:58985:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
58985 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_164group_min’:
pandas/_libs/groupby.c:59784:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
59784 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_166group_min’:
pandas/_libs/groupby.c:60583:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
60583 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
      |                              ^~
pandas/_libs/groupby.c: In function ‘__pyx_pf_6pandas_5_libs_7groupby_168group_min’:
pandas/_libs/groupby.c:61376:30: warning: comparison of integer expressions of different signedness: ‘Py_ssize_t’ {aka ‘long int’} and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
61376 |   __pyx_t_3 = ((!((__pyx_t_2 == __pyx_t_1) != 0)) != 0);
```

LGTM.  Might want to open an issue with cython; i think in theory these are supposed to be equivalent Looks like also part of 3.0 release

https://github.com/cython/cython/issues/2992

Sent from my iPhone

> On Mar 17, 2020, at 6:16 PM, jbrockmendel <notifications@github.com> wrote:
> 
> ﻿
> LGTM. Might want to open an issue with cython; i think in theory these are supposed to be equivalent
> 
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub, or unsubscribe.
 > Looks like also part of 3.0 release [cython/cython#2992](https://github.com/cython/cython/issues/2992)
> […](#)
> Sent from my iPhone
> On Mar 17, 2020, at 6:16 PM, jbrockmendel ***@***.***> wrote: ﻿ LGTM. Might want to open an issue with cython; i think in theory these are supposed to be equivalent — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

That's great!

---

In ea678f0 I have added "TODO" notes, to revert this code change. thanks @MomIsBestFriend 