BUG: GH17525 Function _get_standard_colors resets global random seed
- [X] closes #17525 
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [X] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=h1) Report
> Merging [#17730](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/030e374940a93b7920c0c2ac5c950668564c3703?src=pr&el=desc) will **decrease** coverage by `0.03%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17730/graphs/tree.svg?token=eZ4WkYLtcO&src=pr&height=150&width=650)](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17730      +/-   ##
==========================================
- Coverage   91.27%   91.23%   -0.04%     
==========================================
  Files         163      163              
  Lines       49766    49859      +93     
==========================================
+ Hits        45422    45490      +68     
- Misses       4344     4369      +25
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.03% <100%> (-0.02%)` | :arrow_down: |
| #single | `40.25% <100%> (-0.15%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/plotting/\_style.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19zdHlsZS5weQ==) | `74.28% <100%> (-0.25%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/util/\_tester.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvX3Rlc3Rlci5weQ==) | `29.41% <0%> (-9.48%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `91.42% <0%> (-0.56%)` | :arrow_down: |
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `96.39% <0%> (-0.51%)` | :arrow_down: |
| [pandas/core/config.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29uZmlnLnB5) | `87.7% <0%> (-0.39%)` | :arrow_down: |
| [pandas/core/indexes/category.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9jYXRlZ29yeS5weQ==) | `97.46% <0%> (-0.29%)` | :arrow_down: |
| [pandas/core/groupby.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ3JvdXBieS5weQ==) | `92.04% <0%> (-0.2%)` | :arrow_down: |
| [pandas/core/ops.py](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvb3BzLnB5) | `91.76% <0%> (-0.13%)` | :arrow_down: |
| ... and [21 more](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17730?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/17730?src=pr&el=footer). Last update [030e374...092c2d5](https://codecov.io/gh/pandas-dev/pandas/pull/17730?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @cmazzullo : Also, you're definitely going to need tests. Hello @cmazzullo! Thanks for updating the PR.





Cheers ! There are no PEP8 issues in this Pull Request. :beers: 

##### Comment last updated on October 03, 2017 at 08:06 Hours UTC Okay, just added one. @cmazzullo Thanks! Sure thing