Bug#1008755: optlang/interface.py unusable with python3.10

[Étienne Mollier]

Source: optlang
Version: 1.4.4-2
Severity: serious
Tags: patch upstream
Justification: RT

Dear Fellow Maintainer,

While addressing failure to build from source in libsbml, I
noticed that python-cobra, one of its reverse dependencies,
had autopkgtest regressions: its test suite failed to run,
raising the following error:

	self = <optlang.glpk_interface.Model object at 0x7f0b21f934c0>, stuff = []
	sloppy = False
	
	    def add(self, stuff, sloppy=False):
	        """Add variables and constraints.
	    
	        Parameters
	        ----------
	        stuff : iterable, Variable, Constraint
	            Either an iterable containing variables and constraints or a single variable or constraint.
	    
	        sloppy : bool
	            Check constraints for variables that are not part of the model yet.
	    
	        Returns
	        -------
	        None
	        """
	        if self._pending_modifications.toggle == 'remove':
	            self.update()
	            self._pending_modifications.toggle = 'add'
	>       if isinstance(stuff, collections.Iterable):
	E       AttributeError: module 'collections' has no attribute 'Iterable'
	
	/usr/lib/python3/dist-packages/optlang/interface.py:1358: AttributeError

The full log is available on ci.debian.net[1].  This turned out
to be caused by optlang.  Using the patch in attachment, I
worked around the issue, and autopkgtest of python-cobra went
back on tracks on my side.

[1]: https://ci.debian.net/data/autopkgtest/testing/amd64/p/python-cobra/20469873/log.gz

Thanks for maintaining optlang!
Have a nice day,  :)
-- 
Étienne Mollier <emollier at emlwks999.eu>
Fingerprint:  8f91 b227 c7d6 f2b1 948c  8236 793c f67e 8f0d 11da
Sent from /dev/pts/11, please excuse my verbosity.
On air: It Bites - The Last Escape
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