Python內置函數locals

來源：懂視網責編：小采時間：2020-11-27 14:28:04

Python內置函數locals

Python內置函數locals:英文文檔：locals()Update and return a dictionary representing the current local symbol table. Free variables are returned by locals() when it is called in function blocks, but not in

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導讀Python內置函數locals:英文文檔：locals()Update and return a dictionary representing the current local symbol table. Free variables are returned by locals() when it is called in function blocks, but not in

英文文檔：

locals()

Update and return a dictionary representing the current local symbol table. Free variables are returned by locals() when it is called in function blocks, but not in class blocks.

說明：

　　1. 函數功能返回當前作用域內的局部變量和其值組成的字典，與globals函數類似(返回全局變量)

>>> locals()
{'__package__': None, '__loader__': , '__doc__': None, '__name__': '__main__', '__builtins__': , '__spec__': None}

>>> a = 1

>>> locals() # 多了一個key為a值為1的項
{'__package__': None, '__loader__': , 'a': 1, '__doc__': None, '__name__': '__main__', '__builtins__': , '__spec__': None}

　　2. 可用于函數內。

>>> def f():
 print('before define a ')
 print(locals()) #作用域內無變量
 a = 1
 print('after define a')
 print(locals()) #作用域內有一個a變量，值為1

 
>>> f

>>> f()
before define a 
{} 
after define a
{'a': 1}

　3. 返回的字典集合不能修改。

>>> def f():
 print('before define a ')
 print(locals()) # 作用域內無變量
 a = 1
 print('after define a')
 print(locals()) # 作用域內有一個a變量，值為1
 b = locals()
 print('b["a"]: ',b['a']) 
 b['a'] = 2 # 修改b['a']值
 print('change locals value')
 print('b["a"]: ',b['a'])
 print('a is ',a) # a的值未變

 
>>> f()
before define a 
{}
after define a
{'a': 1}
b["a"]: 1
change locals value
b["a"]: 2
a is 1
>>>

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Python內置函數locals

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標簽：函數 python 內置函數

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Python內置函數locals

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