args_pass_to_func_01.py

# ===================================================================
# Arguments Passed to Function
# ===================================================================
# Python uses a mechanism, which is known as "Call-by-Object",
# sometimes also called "Call by Object Reference" or "Call by
# Sharing". If you pass immutable arguments like integers,
# strings or tuples to a function, the passing acts like
# call-by-value. ... It's different, if we pass mutable arguments.
# ===================================================================

def func(x):
    x = 2
    print('func  : x = {}'.format(x))
    return

i = 1

print('before: i = {}'.format(i))

func(i)

print('after : i = {}'.format(i))