Python 列表的复制操作

2013-10-18 10:07:03|

 

import copy

a = [1,2,3,['a','b']]

b = a

c = a[:]

d = copy.copy(a)

e = copy.deepcopy(a)

print "a         ",a

print "=         ",b

print "[:]         ",c

print "copy      ",d

print "deepcopy ",e

print 

 

a[0] = 9

print "a         ",a

print "=         ",b

print "[:]         ",c

print "copy      ",d

print "deepcopy ",e

print 

a[-1][0] = 'x'

 

print "a         ",a

print "=         ",b

print "[:]         ",c

print "copy      ",d

print "deepcopy ",e

 

输出：

a          [1, 2, 3, ['a', 'b']]

=          [1, 2, 3, ['a', 'b']]

[:]          [1, 2, 3, ['a', 'b']]

copy       [1, 2, 3, ['a', 'b']]

deepcopy  [1, 2, 3, ['a', 'b']]

 

a          [9, 2, 3, ['a', 'b']]

=          [9, 2, 3, ['a', 'b']]

[:]          [1, 2, 3, ['a', 'b']]

copy       [1, 2, 3, ['a', 'b']]

deepcopy  [1, 2, 3, ['a', 'b']]

 

a          [9, 2, 3, ['x', 'b']]

=          [9, 2, 3, ['x', 'b']]

[:]          [1, 2, 3, ['x', 'b']]

copy       [1, 2, 3, ['x', 'b']]

deepcopy  [1, 2, 3, ['a', 'b']]