Python: Global Variable Access

Current post is on how to access the global variables in Python 3.2. 

Global variables can be easily accessed by using the keyword global.

According to Python 3.2 documentation:

The global statement is a declaration which holds for the entire current code block. It means that the listed identifiers are to be interpreted as globals. It would be impossible to assign to a global variable without global, although free variables may refer to globals without being declared global.

Names listed in a global statement must not be used in the same code block textually preceding that global statement.

Names listed in a global statement must not be defined as formal parameters or in a for loop control target, class definition, function definition, or import statement.

Example 1: Change the global variable

globalVariable = False

def ChangeGlobalFunction():
      """Function that changes global variable"""
      global  globalVariable  #Global statement
      globalVariable = True

def PrintGlobalFunction():
      """Function that prints global variable"""
      print(globalVariable)

PrintGlobalFunction()
ChangeGlobalFunction()
PrintGlobalFunction()

Output:

False
True