scope, function, mutable
gusarer at gmail.com
gusarer at gmail.com
Tue Dec 4 05:55:44 EST 2012
Hi,
What is the appropriate definition for the following behavior in Python 2.7
(see code below).
Both functions have assignment in it (like "x = ") so I assume, that x is a
local variable in both functions.
Also I thought this rule doesn't depend on WHERE in this function we find
the assignment.
But in both functions x becomes local variable only AFTER assignment, so in
f2 x[1] = 99 changes the global varialble (btw, x[3] = 99 doesn't).
def f1(x):
x = [44] + x[1:]
x[1] = 99
def f2(x):
x[1] = 99
x = [44] + x[1:]
x[3] = 99
t = [1,2,3,4,5,6,7]
f1(t)
print t # [1, 2, 3, 4, 5, 6, 7]
t = [1,2,3,4,5,6,7]
f2(t)
print t # [1, 99, 3, 4, 5, 6, 7]
Thank you.
Roman Gusarev.
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