When 'index' or 'columns' is passed as pandas axis, convert to corres…

[gsganden]

…ponding int

• I have visited the source website, and in particular
  read the known issues
• I have searched through the issue tracker for duplicates
• I have mentioned version numbers, operating system and
  environment, where applicable:

  import tqdm, sys
  print(tqdm.__version__, sys.version, sys.platform)

• If applicable, I have mentioned the relevant/related issue(s)

[codecov-io]

Codecov Report

Merging #570 into master will decrease coverage by 0.57%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #570      +/-   ##
=========================================
- Coverage   99.27%   98.7%   -0.58%     
=========================================
  Files           8       8              
  Lines         692     696       +4     
  Branches      123     125       +2     
=========================================
  Hits          687     687              
- Misses          3       5       +2     
- Partials        2       4       +2

[gsganden]

A performance test failed on Python 2.7. I'm not sure whether or how to address this issue.

[chengs]

the error in performance test is not caused by your code.
I think your code is fine
.