Python | locals () function

Michael Zippo

Symbol table: is a compiler-generated data structure used to store all the information needed to run a program.
Local symbol table: This symbol table stores all the information required for the local scope of a program and is accessed using the Python built-in locals () function .

Syntax: locals ()

Parameters: This function does not take any input parameter.
Return Type: This returns the information stored in local symbol table.

Example # 1:

# Python program for understanding locals

# no local variable here

def demo1 () :

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

# local variables are present here

def demo2 ():

name = "Ankit"

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

# driver code
demo1 ()
demo2 ()

Exit :

 Here no local variable is present: {} Here local variables are present: {’name’:’ Ankit’}

Example # 2: Updating using locals () .

Unlike globals (), this function cannot modify local symbol table data. The program below explains it clearly.

# Python program for understanding locals

# no local variable here

def demo1 ():

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

# local variables are present here

def demo2 ():

name = "Ankit"

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

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

# trying change name value

locals () [ ’name’ ] = "Sri Ram"

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

# driver code
demo1 ()
demo2 ()

Exit:

 Here no local variable is present: {} Here local variables are present: {’name’:’ Ankit’} Before updating name is: Ankit after updating name is: Ankit

Example # 3: locals () for the global environment .

The local symbol table is the same as the global symbol table for the global environment.

# Python program for understanding locals

# data using locals

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

# data using globals

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

Exit:

This is using locals (): {’__file__’: ’/ home / 34dde64e1e47944021cdf478b97f13a0.py ’,’ __doc__ ’: None,’ __name__ ’:’ __main__ ’,’ __cached__ ’: None,’ __spec__ ’: None,’ __builtins__ ’: & lt-in module’ )ins’ (built , ’__package__’: None, ’__loader__’:% lt; _frozen_importlib_external.SourceFileLoader object at 0x7f88 5e463470"}
This is using globals (): {’__file__’: ’/home/34dde64e1e47944021cdf478b97f13a0.py’, ’__doc__’: None, ’__name__’: ’__main__’, ’__cached__’: None ’: None,’ __builtins__ ’: "module’ builtins’ (built-in) & gt ;, ’__package__’: None, ’__loader__’: "_frozen_importlib_external.SourceFileLoader object at 0x7f885e463470 & gtlock;}