Common mistakes we make in Python and why we should avoid that part 3

def mutable_test_function(first, second=[]):
return second
mutable_test_function([1,2,3], [1,2,3])
Out[63]: [1, 2, 3, 1, 2, 3]
In [64]: mutable_test_function([1,2,3])
Out[64]: [1, 2, 3]
In [65]: mutable_test_function([1,2,3])
Out[65]: [1, 2, 3, 1, 2, 3]
In [66]: mutable_test_function([1,2,3])
Out[66]: [1, 2, 3, 1, 2, 3, 1, 2, 3]
def mutable_test_function(first, second=None): 
if second is None:
second = []
return second
In [74]: mutable_test_function([1,2,3])
Out[74]: [1, 2, 3]
In [75]: mutable_test_function([1,2,3])
Out[75]: [1, 2, 3]
In [76]: mutable_test_function([1,2,3])
Out[76]: [1, 2, 3]




Coding, Reading,Python

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