### EXAMPLE 01: CREATE FUNCTION WITH IF / ELSE STATEMENT

def switch_operations_if_else(operator, x, y):

if operator == 'add':

return x + y

elif operator == 'sub':

return x - y

elif operator == 'mul':

return x * y

elif operator == 'div':

return x / y

else:

return None

def add(x, y): return x + y

def sub(x, y): return x - y

def mul(x, y): return x * y

def div(x, y): return x / y

### EXAMPLE 02: USING FUNCTION IN DICTIONARY

def switch_operations_functions(operator, x, y):

return {

'add': add(x, y),

'sub': sub(x, y),

'mul': mul(x, y),

'div': div(x, y)

}.get(operator, None)

### EXAMPLE 03: USING LAMBDA IN DICTIONARY

def switch_operations_lambda(operator, x, y):

return {

'add': lambda: x + y,

'sub': lambda: x - y,

'mul': lambda: x * y,

'div': lambda: x / y

}.get(operator, lambda: None)()

switch_operations_if_else('mul', 5, 5) # return : 25

switch_operations_functions('mul', 5, 5) # return : 25

switch_operations_lambda('mul', 5, 5) # return : 25

switch_operations_if_else('bad_value', 5, 5) # return : None

switch_operations_functions('bad_value', 5, 5) # return : None

switch_operations_lambda('bad_value', 5, 5) # return : None