43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
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---
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title: Python Idobject
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localeTitle: Python Idobject
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---
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`id()`是Python 3中的内置函数，它返回对象的_标识_ 。 _标识_是该对象在其生命周期内的唯一整数。这也是内存中对象的地址。
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## 论据
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#### 目的
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`object`参数通常可以是`int` ， `float` ， `str` ， `list` ， `dict` ， `tuple`等。
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## 代码示例
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```
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a = 2
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print(id(a)) #=> 140454723286976 (Values returned by id() might be different for different users)
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b = 3
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print(id(b)) #=> 140454723287008
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c = 2
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print(id(c)) #=> 140454723286976 (This is same as id(a) since they both contain the same value and hence have same memory address)
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print(id(a) == id(b)) #=> False (since a and b have different values stored in them)
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print(id(a) == id(c)) #=> True (since a and c have same values stored in them)
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d = 1.1
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e = 1.1
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print(id(d) == id(e)) #=> True (since d and e have same values stored in them)
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str1 = 'hello'
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str2 = 'hello'
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print(id(str1) == id(str2)) #=> True (since str1 and str2 have same values stored in them)
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# For complex objects like lists, tuples, dictionaries etc. id() would give a unique integer even if the content of those containers is same.
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tup1 = (1,1)
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tup2 = (1,1)
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print(id(tup1) == id(tup2)) #=> False
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```
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 [运行代码](https://repl.it/CQw7/1)
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[官方文件](https://docs.python.org/3/library/functions.html#id)
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