NZMATH  1.2.0
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compatibility.py
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1 """
2 compatibility between Python version
3 """
4 
5 # __builtins__.set is in >=2.4, sets.Set is in >=2.3.
6 # Be careful that the compatibility is not perfect.
7 try:
8  set, frozenset
9 except NameError:
10  import sets
11  __builtins__["set"] = sets.Set
12  __builtins__["frozenset"] = sets.ImmutableSet
13  del sets
14 
15 # __builtins__.cmp is only in <3.0.
16 # Be careful that the compatibility is not perfect.
17 try:
18  cmp
19 except NameError:
20  cmp = lambda x,y: (x>y) - (x<y)
21  __builtins__["cmp"] = cmp
22  del cmp
23 
24 # builtin len() raises OverflowError when the result > sys.maxint.
25 # I'm not sure this restriction will go away in the future.
26 # The following function card() ought to be used instead of len()
27 # for obtaining cardinality of sets or set-like objects.
28 def card(virtualset):
29  """
30  Return cardinality of the virtualset.
31  """
32  if hasattr(virtualset, "card"):
33  return virtualset.card()
34  return len(virtualset)
35 
36 __builtins__["card"] = card
nzmath.compatibility.card
def card(virtualset)
Definition: compatibility.py:28