Python100例--007

题目：将一个列表的数据复制到另一个列表中。
方法一：

# -*- coding:utf-8 -*-
a = [1,2,3]
b = a[:]
print b

方法二：

# -*- coding:utf-8 -*-
import copy
a = [1,2,3]
b = copy.copy(a)
print b

方法三：

# -*- coding:utf-8 -*-
a = [1,2,3]
b = []
for i in range(len(a)):
    b.append(a[i])
print b

方法四：

# -*- coding:utf-8 -*-
a = [1,2,3]
b = [i for i in a]
print b