Help understanding list operatoins inside functions in python 3

stephen.boulet at gmail.com stephen.boulet at gmail.com
Tue Jan 13 07:51:19 EST 2015

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I'm a bit confused why in the second case x is not [1,2,3]:
x = []
def y():
 x.append(1)
def z():
 x = [1,2,3]
y()
print(x)
z()
print(x)
Output:
[1]
[1]

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