python list copy
测试代码
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']]
