BUG #21374: Fix divison with complex numbers in eval() method
- [ ] closes #21374 
- [ ] tests added / passed
```python
data = {"a": [1 + 2j], "b": [1 + 1j]}
df = pd.DataFrame(data = data)
df.eval("a/b")
```
Expected output:
```python
df["a"]/df["b"]

0    (1.5+0.5j)
dtype: complex128
```
New result:
```python
df.eval("a/b")

0    (1.5+0.5j)
dtype: complex128
```
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @fillipe-gsm! Thanks for updating the PR.



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

##### Comment last updated on June 14, 2018 at 02:15 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=h1) Report
> Merging [#21472](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/b5fc76954963e30b7d7dd4c30ed7363568fd01ee?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/21472/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #21472      +/-   ##
==========================================
- Coverage    91.9%   91.89%   -0.01%     
==========================================
  Files         153      153              
  Lines       49606    49606              
==========================================
- Hits        45589    45587       -2     
- Misses       4017     4019       +2
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.29% <100%> (-0.01%)` | :arrow_down: |
| #single | `41.89% <0%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/computation/ops.py](https://codecov.io/gh/pandas-dev/pandas/pull/21472/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vb3BzLnB5) | `95.6% <100%> (ø)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/21472/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `84.6% <0%> (-0.21%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=footer). Last update [b5fc769...72252e1](https://codecov.io/gh/pandas-dev/pandas/pull/21472?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 tests! @fillipe-gsm this is almost ready, just needs a unit test and what’s new entry. closing. needs tests. pls ping if able to update.