I have been using distutils' "python setup.py config"
command in order to do some configuration steps before
the build and install.
On Linux and Mac OS X, when doing trial compilations I
get this error: 

  File
"/usr/local/lib/python2.3/distutils/command/config.py",
line 154, in _link
    prog = prog + self.compiler.exe_extension
TypeError: cannot concatenate 'str' and 'NoneType' objects

The problem is that on Mac OS X and Linux,
self.compiler.exe_extension is None instead of "", and
Python doesn't allow None to be concatenated with a
string. The solution would be either to set
self.compiler.exe_extension to "" instead of None, or
to check if self.compiler.exe_extension is None before
concatenating. The attached patch does the latter:

if self.compiler.exe_extension:
    prog = prog + self.compiler.exe_extension

Changing self.compiler.exe_extension to "" instead of
None may be a cleaner solution, but I don't know how
that would affect other parts of the distutils, which
is why I went with the solution above.


Michiel de Hoon (mdehoon@ims.u-tokyo.ac.jp)
University of Tokyo, Human Genome Center

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Apart from the tab character in the patch, this looks good. Checked in as rev. 1.16 of distutils/command/config.py