The function matplotlib.cbook.iterable has the documentation:
def iterable(obj):
'return true if *obj* is iterable'
try: len(obj)
except: return False
return True
However, in Sage, we have some objects that have __len__ defined, but
are not iterable (i.e., they don't implement the iterator protocol).
This is causing us problems when we try to plot some things that use
this function, and matplotlib falsely assumes that the things are
iterable. After checking around online, it seems that it is safer to
check for iterability by doing something like:
try: iter(obj)
except TypeError: return False
return True
or
import collections
return isinstance(obj, collections.Iterable) # only works for new-style
classes
Or maybe even combining these would be better (though it might be really
redundant and slow, after looking at the code in collections.Iterable...):
try: iter(obj)
except TypeError:
import collections
return isinstance(obj, collections.Iterable)
return True
You guys are the python experts, though. What do you think?
Thanks,
Jason
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