BUG: Correct Escaping for LaTeX, #20859
- [x] closes #20859
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnewentry
Hello @ScientiaEtVeritas! Thanks for updating the PR.





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

##### Comment last updated on April 29, 2018 at 20:28 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20860?src=pr&el=h1) Report
> Merging [#20860](https://codecov.io/gh/pandas-dev/pandas/pull/20860?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/563a6ad108a79b0192a25d51d743812a18e21b15?src=pr&el=desc) will **increase** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/20860/graphs/tree.svg?token=eZ4WkYLtcO&width=650&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/20860?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #20860      +/-   ##
==========================================
+ Coverage   91.77%   91.78%   +<.01%     
==========================================
  Files         153      153              
  Lines       49313    49313              
==========================================
+ Hits        45259    45261       +2     
+ Misses       4054     4052       -2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.17% <100%> (ø)` | :arrow_up: |
| #single | `41.88% <0%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/20860?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/formats/latex.py](https://codecov.io/gh/pandas-dev/pandas/pull/20860/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvbGF0ZXgucHk=) | `100% <100%> (ø)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/20860/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `84.59% <0%> (+0.2%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20860?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/20860?src=pr&el=footer). Last update [563a6ad...d0ec214](https://codecov.io/gh/pandas-dev/pandas/pull/20860?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 looks ok to me. @toobaz @TomAugspurger  Thanks @ScientiaEtVeritas!