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Python copy objects (deep copy deepcopy and shallow copy copy)

高洛峰

Release： 2017-01-19 11:31:49

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1. copy.copy shallow copy only copies the parent object, and does not copy the internal child objects of the object.
2. copy.deepcopy deep copy object and its sub-objects
A good example:

import copy
a = [1, 2, 3, 4, [&#39;a&#39;, &#39;b&#39;]]  #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(&#39;c&#39;)  #修改对象a中的[&#39;a&#39;, &#39;b&#39;]数组对象

print &#39;a = &#39;, a
print &#39;b = &#39;, b
print &#39;c = &#39;, c
print &#39;d = &#39;, d

Copy after login

Output result:
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 ']]

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Related labels：

Python 拷贝对象

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