UnicodeDecodeError

running command over PuTTY on Ubuntu 3.13, python 2.7.6

$ ./python -m test test_mailcap

[1/1] test_mailcap
test test_mailcap failed -- Traceback (most recent call last):
  File "/home/petrosr2/Documents/opensource/cpy/Lib/test/test_mailcap.py", line 126, in test_system_mailcap
    caps = mailcap.getcaps()
  File "/home/petrosr2/Documents/opensource/cpy/Lib/mailcap.py", line 26, in getcaps
    morecaps = readmailcapfile(fp)
  File "/home/petrosr2/Documents/opensource/cpy/Lib/mailcap.py", line 64, in readmailcapfile
    line = fp.readline()
  File "/home/petrosr2/Documents/opensource/cpy/Lib/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3820: ordinal not in range(128)

1 test failed:
    test_mailcap

I can reproduce the failure by arbitrarily adding a non-ascii character to one of the mailcap files searched for by the mailcap module (https://docs.python.org/3/library/mailcap.html#mailcap.getcaps), like $HOME/.mailcap, and by setting the process to an ascii-only locale (export LANG=C).  While this might be a somewhat unusual combination in practice, mailcap should be able to handle it.

By the way, this is a Python 3 problem since test_mailcap does not exist in Python 2.  2.7.6 might be the version of the system-supplied Python, but you appeared to be running with a Python you built.  Try

  ./python -V

to show the version of the Python you are using.