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test_copy.py
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68 lines (53 loc) · 1.42 KB
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#!/usr/bin/env python
# encoding: utf-8
"""
@author: zhanghe
@software: PyCharm
@file: test_copy.py
@time: 16-2-17 上午11:07
"""
import copy
def test_01():
"""
测试可变类型对象的拷贝
"""
a = [1, 2, 3, 4, ['a', 'b']] # 原始对象
b = a # 赋值，传对象的引用
c = copy.copy(a) # 对象拷贝，浅拷贝
d = copy.deepcopy(a) # 对象拷贝，深拷贝
a.append(5) # 修改对象a
a[4].append('c') # 修改对象a中的['a', 'b']数组对象
print 'a = ', a
print 'b = ', b
print 'c = ', c
print 'd = ', d
def test_02():
"""
测试不可变类型对象的拷贝
"""
a = [1, 2, 3, 4, 5] # 原始对象
b = a # 赋值，传对象的引用
c = copy.copy(a) # 对象拷贝，浅拷贝
d = copy.deepcopy(a) # 对象拷贝，深拷贝
a[4] = 6 # 修改对象a
print 'a = ', a
print 'b = ', b
print 'c = ', c
print 'd = ', d
if __name__ == '__main__':
test_01()
test_02()
"""
a = [1, 2, 3, 4, ['a', 'b', 'c'], 5]
b = [1, 2, 3, 4, ['a', 'b', 'c'], 5]
c = [1, 2, 3, 4, ['a', 'b', 'c']]
d = [1, 2, 3, 4, ['a', 'b']]
a = [1, 2, 3, 4, 6]
b = [1, 2, 3, 4, 6]
c = [1, 2, 3, 4, 5]
d = [1, 2, 3, 4, 5]
如果对象本身是不可变的，那么浅拷贝时也会产生两个值
顺便回顾下Python标准类型的分类：
可变类型： 列表，字典
不可变类型：数字，字符串，元组
"""