Thanks for the review, Éric. New patch attached.

> When running a setup.py that uses a tuple for classifiers, is the error message in the terminal user-friendly, or do we get a full traceback?

A full traceback:

Traceback (most recent call last):
  File "setup.py", line 37, in <module>
    platforms=('Windows', 'Any'),
  File "/home/berker/projects/cpython/default/Lib/distutils/core.py", line 108, in setup
    _setup_distribution = dist = klass(attrs)
  File "/home/berker/projects/cpython/default/Lib/distutils/dist.py", line 253, in __init__
    getattr(self.metadata, "set_" + key)(val)
  File "/home/berker/projects/cpython/default/Lib/distutils/dist.py", line 1212, in set_platforms
    raise TypeError(msg % type(value).__name__)
TypeError: 'platforms' should be a 'list', not 'tuple'