why i can't set locale?

[contro opinion]

>>> locale.setlocale(locale.LC_ALL, 'gbk')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/locale.py", line 513, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting
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