>>> def mod(x,y):
return x.append(y)
>>> mod([1,2],3)
>>> k=[1,2,3]
>>> k
[1, 2, 3]
>>> l = mod(k,4)
>>> l
>>> k
[1, 2, 3, 4]
>>> l
>>> k==l
False
>>> mod(k,5)
>>> k
[1, 2, 3, 4, 5]
>>> mod(l,4)
Traceback (most recent call last):
File "<pyshell#29>", line 1, in <module>
mod(l,4)
File "<pyshell#18>", line 2, in mod
return x.append(y)
AttributeError: 'NoneType' object has no attribute 'append'
>>> l
>>> l=k
>>> l
[1, 2, 3, 4, 5]
>>> i=mod(k,1)
>>> i
>>>
same stuff but i dont find this intuitive.
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