Python locale error: unsupported locale setting

pip don't install package.

Python locale error: unsupported locale setting

 ..

>>> import locale
>>> print str( locale.getlocale() )
(None, None)
>>> locale.setlocale(locale.LC_ALL, 'de_DE')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/locale.py", line 531, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

　　

Run following commands

export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"
sudo dpkg-reconfigure locales