locals()Python中的function返回当前本地符号表的字典。

符号表：它是由编译器创建的数据结构，用于存储执行程序所需的所有信息。

本地符号表：该符号表存储了程序本地范围所需的所有信息，并且可以使用python内置函数来访问此信息locals()。

用法： locals()

参数：此函数不接受任何输入参数。

返回类型：这将返回存储在本地符号表中的信息。

范例1：

# Python program to understand about locals

# here no local variable is present

def demo1():

print("Here no local variable  is present:", locals())

# here local variables are present

def demo2():

name = "Ankit"

print("Here local variables are present:", locals())

# driver code

demo1()

demo2()

输出：

Here no local variable is present: {}

Here local variables are present: {'name':'Ankit'}

范例2：使用更新locals()。

与globals()不同，此功能无法修改本地符号表的数据。下面的程序清楚地说明了这一点。

# Python program to understand about locals

# here no local varible is present

def demo1():

print("Here no local variable  is present:", locals())

# here local variables are present

def demo2():

name = "Ankit"

print("Here local variables are present:", locals())

print("Before updating name is :", name)

# trying to change name value

locals()['name'] = "Sri Ram"

print("after updating name is:", name)

# driver code

demo1()

demo2()

输出：

Here no local variable is present: {}

Here local variables are present: {'name':'Ankit'}

Before updating name is : Ankit

after updating name is: Ankit

范例3： locals()为全球环境。

在全局环境下，本地符号表与全局符号表相同。

# Python program to understand about locals

# data using locals

print("This is using locals():", locals())

# data using globals

print("This is using globals():", globals())

输出：

This is using locals():{‘__file__’:‘/home/34dde64e1e47944021cdf478b97f13a0.py’, ‘__doc__’:None, ‘__name__’:‘__main__’, ‘__cached__’:None, ‘__spec__’:None, ‘__builtins__’:, ‘__package__’:None, ‘__loader__’:%lt;_frozen_importlib_external.SourceFileLoader object at 0x7f885e463470>}

This is using globals():{‘__file__’:‘/home/34dde64e1e47944021cdf478b97f13a0.py’, ‘__doc__’:None, ‘__name__’:‘__main__’, ‘__cached__’:None, ‘__spec__’:None, ‘__builtins__’:, ‘__package__’:None, ‘__loader__’:<_frozen_importlib_external.sourcefileloader object at>}