Python Define a function only if code example

Example: keyword for empty function to continue the block python

# Correct way of writing empty function 
# in Python 
def fun(): 
	pass

  
# Empty loop in Python 
mutex = True
while (mutex == True) : 
	pass

  
# Empty in if/else in Python 
mutex = True
if (mutex == True) : 
	pass
else : 
	print("False")