On 01/13/15 23:51, stephen.bou...@gmail.com wrote:
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]
In your y() function, as you are appending data, the list must already
exist. So the global list x is used
In your z() function, you are creating a local list x which only exists
as long as you are in the function.
Anything you do to that list has no effect on the global list x. That is
why the list does not change.
If you specifically wanted to change the global list x, you could do this:
def z():
global x
x = [1, 2, 3]
Output:
[1]
[1, 2, 3]
Or better
def z():
x = [1, 2, 3]
return x
y()
print(x)
x = z()
print(x)
Output:
[1]
[1, 2, 3]
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