Python 可变对象与不可变对象

 

1、

不可变（immutable）：int、字符串(string)、float、（数值型number）、元组（tuple)

可变（mutable）：字典型(dictionary)、列表型(list)

>>>person=['name',['saving',100]]
>>>ly=person[:]
>>> zhuzhu=list(person)

>>> zhuzhu

['name', ['saving', 100.0]]

>>> [id(x)for x in person ,ly,zhuzhu]

[4539621960, 4539684984, 4539685560]

>>> ly[0]='ly'

>>> ly

['ly', ['saving', 100.0]]

>>> zhuzhu

['name', ['saving', 100.0]]

>>> zhuzhu[0]=['zhuzhu']

>>> zhuzhu

[['zhuzhu'], ['saving', 100.0]]

>>> zhuzhu[1][1]=40

>>> zhuzhu

[['zhuzhu'], ['saving', 40]]

>>> ly

['ly', ['saving', 40]]

>>> ly[1][0]='newsaving'

>>> ly

['ly', ['newsaving', 40]]

>>> zhuzhu

[['zhuzhu'], ['newsaving', 40]]

参考链接：

1、http://blog.csdn.net/taohuaxinmu123/article/details/39008281