When I tried to use pip to install Cython, I found that an error occurred while compiling. And some basic pip command also gave the same result: UnicodeDecodeError.

The error messages are all like this:

─➤  pip help install
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/pip/basecommand.py", line 126, in main
    self.run(options, args)
  File "/usr/local/lib/python2.6/dist-packages/pip/commands/help.py", line 19, in run
    command.parser.print_help()
  File "/usr/lib/python2.6/optparse.py", line 1664, in print_help 
    file.write(self.format_help().encode(encoding, "replace"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 2964: ordinal not in range(128)

I have successfully installed other packages by pip and I don't know why this occurs suddenly. Can anyone tell me how to fix this bug?

Thank you!

Some info: pip 1.0.2 on Ubuntu 10.04

python pip
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