Question

有人可以在下面的代码中告诉我，如何防止＆＃34; Cvalue＆＃34;附加到＆＃34; fred＆＃34;当我只想将它附加到结果[键]？
我使用的是python 2.7，但python 3的行为相同。


#!/usr/bin/env python

hdict = {52951331: [5], 23396132: [4], 82982473: [19, 37], 126988879: [20] }
Cdict = {23396132: [19, 37], 82982473: [4], 126988879: [5], 52951331: [20]}

result = {}
for key, value in hdict.iteritems():
    if key in Cdict:
        result[key] = value
        for Cvalue in Cdict[key]:
            fred = value
            print 'fred1: ', fred
            result[key].append(Cvalue)
            print 'fred2: ', fred

Answer 1

为什么不尝试使用副本。

#!/usr/bin/env python

import copy

hdict = {52951331: [5], 23396132: [4], 82982473: [19, 37], 126988879: [20]}

Cdict = {23396132: [19, 37], 82982473: [4], 126988879: [5], 52951331: [20]}
result = {}

for key, value in hdict.iteritems():

if key in Cdict:

    result[key] = value
    for Cvalue in Cdict[key]:
        fred = copy.copy(value)
        print 'fred1: ', fred
        value.append(Cvalue)
        print 'fred2: %s, value: %s' % (fred, value)

附加到python dict会影响另一个变量

1 个答案: