When you call c3.createJoe(c1.fred), you are passing a copy of the
value stored in c1.fred to your function. Python passes function
parameters by value. The function will not destructively modify its
arguments; you must expliticly state your intention to modify an
object:
class one():
fred = 'fred'
class three():
def createJoe(self, myName):
return "Joe"
def main():
c1 = one()
c3 = three()
c1.fred = c3.createJoe() # Modify c1's attribute, fred, with the
return value from c3.createJoe
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