Switch Case in Python

Question

It seems like all the functions are executed then one() is being executed. How do i go to function one() without executing all the other functions?

sample.py

#!/usr/bin/python

def zero():
    print("This is func zero")
    return "Test"

def one():
    print("This is func one")
    return True

def two():
    print("This is func two")
    x = 7
    print("%d" % x)
    return False

def numbers_to_strings(argument): 
    switcher = { 
        0: zero(), 
        1: one(), 
        2: two(), 
    } 

    return switcher.get(argument, "nothing") 

# Driver program 
if __name__ == "__main__": 
    argument=1
    print(numbers_to_strings(argument))

Output

This is func zero
This is func one
This is func two
7
True

Expected

This is func one
True

Or is there an explanation why it works this way? Thanks in advance! New to Python btw

Mikel · Accepted Answer · 2019-07-25 02:54:58Z

6

The parentheses call the function.

So only use parentheses on the function you want to call.

def numbers_to_strings(argument): 
    switcher = { 
        0: zero, 
        1: one, 
        2: two, 
    } 

    f = switcher.get(argument)
    if f:
        return f()
    return "nothing"

answered Jul 25, 2019 at 2:54

Mikel

25.9k8 gold badges70 silver badges66 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

filbranden Over a year ago

Or: switcher.get(argument, lambda: "nothing"), after which you can simply return f(), since the default will be a function that when called with no arguments produces the expected "nothing".

Jojoleo · Accepted Answer · 2019-07-26 03:08:33Z

0

Here's it!

#!/usr/bin/python

def zero():
    print("This is func zero")
    return "Test"

def one():
    print("This is func one")
    return True

def two():
    print("This is func two")
    x = 7
    print("%d" % x)
    return False

def numbers_to_strings(argument): 
    switcher = { 
        0: zero, 
        1: one, 
        2: two, 
    } 

    f = switcher.get(argument)
    if f:
        return f()
    return "nothing"

if __name__ == "__main__": 
    argument=1
    print(numbers_to_strings(argument))

answered Jul 26, 2019 at 3:08

Jojoleo

1912 silver badges12 bronze badges

Collectives™ on Stack Overflow

Switch Case in Python

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related