python中id是什么意思

来源：动视网责编：小OO 时间：2023-05-12 10:11:14

python中id是什么意思

Python官方文档给出的解释是。id(object)Return the “identity” of an object.This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime.Two objects with non-overlapping lifetimes may have the same id() value.CPython implementation detail： This is the address of the object in memory。由此可以看出。

推荐度：

点击下载本文 文档为doc格式

导读Python官方文档给出的解释是。id(object)Return the “identity” of an object.This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime.Two objects with non-overlapping lifetimes may have the same id() value.CPython implementation detail： This is the address of the object in memory。由此可以看出。

Python官方文档给出的解释是

id(object)Return the “identity” of an object. This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value.CPython implementation detail: This is the address of the object in memory.

由此可以看出：

1、id(object)返回的是对象的“身份证号”，唯一且不变，但在不重合的生命周期里，可能会出现相同的id值。此处所说的对象应该特指复合类型的对象(如类、list等)，对于字符串、整数等类型，变量的id是随值的改变而改变的。

2、一个对象的id值在CPython解释器里就代表它在内存中的地址。(CPython解释器：http://zh.wikipedia.org/wiki/CPython)

class Obj(): def __init__(self,arg): self.x=arg if __name__ == '__main__': obj=Obj(1) print id(obj) #32754432 obj.x=2 print id(obj) #32754432 s="abc" print id(s) #1401904453184 s="bcd" print id(s) #32809848 x=1 print id(x) #15760488 x=2 print id(x) #157604

python中id是什么意思

Python官方文档给出的解释是。id(object)Return the “identity” of an object.This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime.Two objects with non-overlapping lifetimes may have the same id() value.CPython implementation detail： This is the address of the object in memory。由此可以看出。

推荐度：

点击下载本文 文档为doc格式

热门焦点

python中id是什么意思

python中id是什么意思

python中id是什么意思

最新推荐

猜你喜欢

热门推荐