Hi everybody
Recently I needed a way to compare the contents of two elements of the
same class (that was of course generated from a schema).
The default comparison of python is to check if the instances are the
same.
The way that this is fixed is by adding a __eq__ method to the class.
Because my class structure is a bit big, I've written a function that
takes two elements and checks them recursively (Note that I've made an
assumption that the members of the class begin with a capital letter,
and that sequences hold the members in the same locations):
def assertEqual(a,b):
if (type(a) != type(b)):
raise "types
differ:"+repr(type(a))+","+repr(type(b))
if (a != b):
raise "values differ:"+repr(a)+","+repr(b)
def isSeq(seq):
return type(seq)==type([])
def compareContents(a,b):
aMembers = [x for x in dir(a) if x < '_']
bMembers = [x for x in dir(b) if x < '_']
assertEqual(aMembers,bMembers)
members = aMembers
if (len(members)==0):
assertEqual(a,b)
for member in members:
if (isSeq(getattr(a,member))):
assertEqual(len(getattr(a,member)),len(getattr(b,member)))
for i in
range(len(getattr(a,member))):
compareContents(getattr(a,member)[i],getattr(b,member)[i])
else:
compareContents(getattr(a,member),getattr(b,member))
How hard will it be to add a __eq__ method to the generated classes, one
that will just compare all the members (also the value of the class, if
it exists) and return true/false accordingly?
Benny.
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