https://bugzilla.novell.com/show_bug.cgi?id=895102
https://bugzilla.novell.com/show_bug.cgi?id=895102#c2
--- Comment #2 from Rolf Krahl 2014-09-08 10:46:15 UTC ---
The problem with "the right way to use it" is the following: most Python
packages are installed using setuptools nowadays. If such a package wants to
provide a command line tool, the standard way using setuptools is not to write
the Python script, but rather to define an entry point into some Python module.
setuptools then generates a wrapper script. This wrapper recursively checks
that all requirements (as defined in requires.txt in the egg-info) are
installed, loads the module and calls the function named in the entry point.
The two-liner in the bug report above is nothing then an explicit call to this
recursive check that the wrapper scripts also perform.
As a consequence, any package that requires matplotlib and installs a command
line scripts using setuptools, will break, if python-nose is not installed,
just because nose is listed as a requirement of matplotlib. This is certainly
not the only way to use matplotlib. But it is the standard way to use it.
On the requirement of python-setuptools: Yes, if some package python-foo
installs a command line script using setuptools, then this script needs
python-setuptools indeed. But this is then a requirement for python-foo, not
for python-matplotlib.
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