Globals() Function In Python

Function Name:

globals

 

Function Signature:

globals()

 

Function Overview:

  • The function globals() returns the module level symbol table as a dictionary instance.

 

  • The symbol table in python is a collection of names and their values as defined in a scope.  Scope could be global-module level or local - function level.

 

  • The module level symbol table in Python contains the following:
  • Module level attributes e.g., __name__, __package__
  • Classes defined in the module
  • Functions defined in the module
  • Constants and Variables declared in the module

 

  • Unlike the dictionary returned by the locals() method, the dictionary returned by the globals() method is not a copy of the module level symbol table.

 

  • It is the module level symbol table itself. Hence any changes made to this dictionary are reflected in the program.

 

Example1:

def A(x):

    y = 0

    z = x

    localNames = locals()

    print(localNames)

   

A(1)

print(globals())

 

Output:

{'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x1006ba320>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'globalsex.py', '__cached__': None, 'A': <function A at 0x100662e18>}

 

 

Example2:

inflation = 1.5

 

print("Inflation is :{}".format(inflation))

   

symbolTable_Module = globals()

 

# Change the inflation variable through symbol table

symbolTable_Module["inflation"] = 1.6

 

# Check the changes made to the dictionary are reflecting in the program

print("Inflation is :{}".format(inflation))

 

 

 

Output:

Inflation is :1.5

Inflation is :1.6


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