1 >>> sequence=(1,2,none,4,none,5)2 >>> total=0
3 >>> def
sum(ss):
4for value in
sequence:
5if value is
none:
6continue
7 total +=total
8return
(total)
910 >>>sum(sequence)
11 traceback (most recent call last):
12 file "", line 1, in 13 sum(sequence)
14 file "", line 5, in sum
15 total +=total
16 unboundlocalerror: local variable 'total' referenced before assignment
17 >>> def
sum(ss):
18for value in
sequence:
19if value is
none:
20continue
21 total +=value
22return
(total)
2324 >>>sum(sequence)
25 traceback (most recent call last):
26 file "", line 1, in 27 sum(sequence)
28 file "", line 5, in sum
29 total +=value
30 31 unboundlocalerror: local variable 'total' referenced before assignment
32 >>> def
sum(ss):
33 total=0
34for value in
sequence:
35if value is
none:
36continue
37 total +=value
38return
(total)
3940 >>>sum(sequence)
41 12
local variable 'total' referenced before assignment的中文意思是：區域性變數在引用前要先賦值。也就是說，def定義的函式中的區域性變數total要在函式內進行預定義，定義為全域性變數不可用。
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