错误的代码①
1
2
3
d = {'a':1, 'b':0, 'c':1, 'd':0}
d
=
{
'a'
:
,
'b'
0
'c'
'd'
}
for key, val in d.items():
for
key, val
in
d.items():
del(d[k])
del
(d[k])
错误的代码② -- 对于Python3
for key, val in d.keys():
d.keys():
正确的代码
4
keys = list(d.keys())
keys
list
(d.keys())
for key, val in keys:
keys:
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