I read in the following thread that the "cmp" method is not needed for sorting and that "key" is egnough : http://bytes.com/topic/python/answer...rison-function
but if you need to compare program version, how do you do this with only "key" method ? -
versions = ["3.5", "1.0", "3.1.3", "1.2.0",
-
"15.15421.21.42.63.1.0.3.54"]
-
ordered = sorted(versions, key=???)
-
Thanks.
2  3632  bvdet 2,851
Recognized Expert Moderator Specialist
One way is to use functools.cmp_t o_key: - from functools import cmp_to_key
-
-
def c(a,b):
-
a1 = [int(item) for item in a.split(".")]
-
b1 = [int(item) for item in b.split(".")]
-
for i in range(min(len(a1), len(b1))):
-
j = cmp(a1[i], b1[i])
-
if j:
-
return j
-
return cmp(a,b)
-
-
versions = ["3.5", "1.0", "3.1.3", "1.2.0", "15.15421.21.42.63.1.0.3.54"]
-
-
versions2 = sorted(versions, key=cmp_to_key(c))
-
-
print versions2
Excellent!
That is just what I need.
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