Script to show how functions in python are objects

functions_as_objects.py

# Script to show how functions are just objects

def shout(word = 'yes'):
    return '%s!' %(word.capitalize())

print shout() # Outputs: Yes!

scream = shout
# As functions are just objects, we can assign them just like a variable assignment

print scream()
# We can then call the function using the variable which we just made an assignment to

del shout
# Deleting the symbol "shout" which was the name of the function initially

try:
    print shout()
except NameError as e:
    print 'exception: %s' %(e)
# We attempt to call "shout" which we just deleted and we get a NameError as the symbol
# does not exist

print scream()
# Outputs: Yes!
# However the function still exist because just like an object there is a symbol pointing to
# the function. So we can call the function using the "scream" symbol