switch-case 1.5

Switch-case statement for Python

switch_case

In Python 3.10 you can use Structural Pattern Matching

Installation

pip3 install switch_case

Usage

from switch_case import *
reason = (
    switch
        | case(_ == 200) >> 'OK'
        | case(_ == 500) >> 'ERROR'
        | default        >> 'UNKNOWN')

assert reason(200) == 'OK'
assert reason(500) == 'ERROR'
assert reason(400) == 'UNKNOWN'

Which is syntax sugar for:

from switch_case import *
from operator import eq
reason = (
    switch
        | case(_ /eq/ 200) >> 'OK'
        | case(_ /eq/ 500) >> 'ERROR'
        | default        >> 'UNKNOWN')

So you can use it like this:

from switch_case import *
get_type = (
    switch
        | case(_ /isinstance/ str)   >> "string"
        | case(_ /isinstance/ int)   >> "integer"
        | case(_ /isinstance/ float) >> "float"
        | case(_ /isinstance/ bool)  >> "bool"
        | default                    >> "other")

Or as a function:

from switch_case import *
def get_type(smth):
    return ~(
        switch(smth)
            | case(_ /isinstance/ str)   >> "string"
            | case(_ /isinstance/ int)   >> "integer"
            | case(_ /isinstance/ float) >> "float"
            | case(_ /isinstance/ bool)  >> "bool"
            | default                    >> "other")

assert get_type(42) == "integer"
assert get_type("42") == "string"
assert get_type(3.14) == "float"