218         yield m

   218         yield m

   219     # These modules only exist on windows, but we should always

   219     # These modules only exist on windows, but we should always

   220     # consider them stdlib.

   220     # consider them stdlib.

   221     for m in ['msvcrt', '_winreg']:

   221     for m in ['msvcrt', '_winreg']:

   222         yield m

   222         yield m

   223     yield 'builtins' # python3 only

   224     yield 'builtins' # python3 only

   224     for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only

   225     for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only

   225         yield m

   226         yield m

   226     for m in 'cPickle', 'datetime': # in Python (not C) on PyPy

   227     for m in 'cPickle', 'datetime': # in Python (not C) on PyPy

   227         yield m

   228         yield m