1+ x ,y = 5 ,3
2+ op = "add"
3+ 4+ if op == "add" :
5+ print (x + y )
6+ elif op == "mul" :
7+ print (x * y )
8+ 9+ match op :
10+ case "add" :
11+ print (x + y )
12+ case "mul" :
13+ print (x * y )
14+ 15+ #Good alternative
16+ functions = {
17+ "add" : lambda x ,y : x + y ,
18+ "mul" : lambda x ,y : x * y
19+ }
20+ 21+ print (functions ["add" ](5 ,3 ))
22+ 23+ #using proper functions
24+ def add (x ,y ):
25+ return x + y
26+ def mul (x ,y ):
27+ return x * y
28+ 29+ functions = {
30+ "add" :add ,
31+ "mul" :mul ,
32+ }
33+ 34+ print (functions ["mul" ](5 ,3 ))
35+ 36+ #emulating match/case pattern
37+ from collections import defaultdict
38+ 39+ cases = defaultdict (lambda * args : lambda * a : "Invalid option" ,{
40+ "add" :add ,
41+ "mul" :mul ,
42+ })
43+ 44+ print (cases ["add" ](5 ,3 ))
45+ #passing parameters
46+ def handle_event (e ):
47+ print (f"Handling event in 'handler_event' with { e } )
48+ return e
49+ 50+ def handle_other_event (e ):
51+ print (f"Handling event in 'handle_other_event' with { e } )
52+ return e
53+ 54+ functions = {
55+ "event1" : lambda arg : handle_event (arg ["some_key" ]),
56+ "event2" : lambda arg : handle_other_event (arg ["some_other_key" ]),
57+ }
58+ 59+ event = {
60+ "some_key" :"value" ,
61+ "some_other_key" :"different value" ,
62+ }
63+ 64+ print (functions ["event1" ](event ))
65+ print (functions ["event2" ](event ))
66+ 67+ #Real world code call it [parse_args.py]
68+ import argparse
69+ 70+ functions = {
71+ "add" :add ,
72+ "mul" :mul ,
73+ }
74+ 75+ parser = argparse .ArgumentParser ()
76+ parser .add_argument (
77+ "operation" ,
78+ choices = ["add" ,"mul" ],
79+ help = "operation to perform (add,mul)" ,
80+ )
81+ 82+ parser .add_argument (
83+ "x" ,
84+ type = int ,
85+ help = "first number"
86+ )
87+ 88+ parser .add_argument (
89+ "y" ,
90+ type = int ,
91+ help = "second number" ,
92+ )
93+ 94+ args = parser .parse_args ()
95+ answer = functions .get (args .operation ,)(args .x ,args .y )
96+ print (answer )
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