CLN: pep8 clean up of sql.py
@jreback master is broken after merging this PR (https://travis-ci.org/pydata/pandas/jobs/35873580), but due to excel importing issues, so something totally unrelated. Any idea?
 just looks like an import error which happens

I think Travis fs freezes and doesn't load the module -

I restarted 

if it repeats then can investigate again 
 Hmm, I already restarted it once, but we'll see
 hmm ok
assume it works locally for u (since u didn't touch that module)

it IS possible that openpyxl versions changed!
(as the 3.4 version does pull the latest)

hmmm
 https://pypi.python.org/pypi/openpyxl

guess what they prob broke it - good thing we test for this

let's open an issue
 cc @neirbowj

looks like openpyxl folks breaking things again 2.05 just came out
it's tested in. 3.4 build

have a look? (see link from above)
 @jreback I'm just getting caught up here. Was out Beating the Blerch earlier. Will look into this.
 thanks

it's now issue #8342
