Fix "ValueError: unknown locale: UTF-8" when running AWS CLI

I was getting following error when running AWS CLI.

MacBook-Pro:python sgoswami$ aws ec2 describe-instances
Traceback (most recent call last):
  File "/usr/local/bin/aws", line 15, in <module>
    import awscli.clidriver
  File "/Library/Python/2.7/site-packages/awscli/clidriver.py", line 31, in <module>
    from awscli.help import ProviderHelpCommand
  File "/Library/Python/2.7/site-packages/awscli/help.py", line 20, in <module>
    from docutils.core import publish_string
  File "/Library/Python/2.7/site-packages/docutils/core.py", line 20, in <module>
    from docutils import frontend, io, utils, readers, writers
  File "/Library/Python/2.7/site-packages/docutils/frontend.py", line 41, in <module>
    import docutils.utils
  File "/Library/Python/2.7/site-packages/docutils/utils/__init__.py", line 20, in <module>
    import docutils.io
  File "/Library/Python/2.7/site-packages/docutils/io.py", line 18, in <module>
    from docutils.utils.error_reporting import locale_encoding, ErrorString, ErrorOutput
  File "/Library/Python/2.7/site-packages/docutils/utils/error_reporting.py", line 47, in <module>
    locale_encoding = locale.getlocale()[1] or locale.getdefaultlocale()[1]
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 496, in getdefaultlocale
    return _parse_localename(localename)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 428, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename
ValueError: unknown locale: UTF-8

All that I did to fix it was: 

export LC_ALL=en_US.UTF-8

export LANG=en_US.UTF-8