Simulation!
Switch statement do not exist in Python. However we can simulate a switch statement using different techniques. In the next example we create a function switch. This is a fake statement to simulate the switch. We use this program as an example. Read and try to understand the program before reading the description below.
Example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #define a value holder function # => True def switch(value): switch.value=value return True #define matching case function # => True or False def case(*args): return any((arg == switch.value for arg in args)) # Switch example: print("Describe a number from range:") for n in range(0,10): print(n, end=" ", flush=True) print() # Ask for a number and analyze x=input("n:") n=int(x) while switch(n): if case(0): print ("n is zero;") break if case(1, 4, 9): print ("n is a perfect square;") break if case(2): print ("n is an even number;") if case(2, 3, 5, 7): print ("n is a prime number;") break if case(6, 8): print ("n is an even number;") break print ("Only single-digit numbers are allowed.") |
Example description
switch: In the example above I use one function “switch” with attribute “value” and one function “case” that return True or False if “switch.value” is one of arguments.
while: Using while loop will iterate one single time ant we can use break statement like a “switch” statement will do. This example demonstrate how using meaningful names for functions python language can be extended in interesting ways.
print: This example also demonstrate how to use print function to print numbers and avoid new line using optional parameter end=” “.
Testing the program
1 2 3 4 5 6 | Describe a number from range: 0 1 2 3 4 5 6 7 8 9 n:3 n is a prime number; Process finished with exit code 0 |
Read next: Closure