Switch Case in Python (Replacement)

What is the replacement of Switch Case in Python?

Unlike every other programming language we have used before, Python does not have a switch or case statement. To get around this fact, we use dictionary mapping.

Method 1: Switch Case implement in Python using Dictionary Mapping

In Python, a dictionary is an unordered collection of data values that can be used to store data values. Unlike other data types, which can only include a single value per element, dictionaries can also contain a key: value pair.
The key value of the dictionary data type functions as cases in a switch statement when we use the dictionary to replace the Switch case statement.

Python3

# Function to convert number into string
# Switcher is dictionary data type here
def numbers_to_strings(argument):
    switcher = {
        0: "zero",
        1: "one",
        2: "two",
    }
 
    # get() method of dictionary data type returns
    # value of passed argument if it is present
    # in dictionary otherwise second argument will
    # be assigned as default value of passed argument
    return switcher.get(argument, "nothing")
 
# Driver program
if __name__ == "__main__":
    argument=0
    print (numbers_to_strings(argument))

Method 2: Switch Case implement in Python using if-else

The if-else is another method to implement switch case replacement. It is used to determine whether a specific statement or block of statements will be performed or not, i.e., whether a block of statements will be executed if a specific condition is true or not.

Python3

bike = 'Yamaha'
 
if fruit == 'Hero':
    print("letter is Hero")
 
elif fruit == "Suzuki":
    print("letter is Suzuki")
 
elif fruit == "Yamaha":
    print("fruit is Yamaha")
 
else:
    print("Please choose correct answer")

Method 3: Switch Case implement in Python using Class

In this method, we are using a class to create a switch method inside the python switch class in Python.

Python3

class Python_Switch:
    def day(self, month):
 
        default = "Incorrect day"
 
        return getattr(self, 'case_' + str(month), lambda: default)()
 
    def case_1(self):
        return "Jan"
 
    def case_2(self):
        return "Feb"
 
    def case_3(self):
        return "Mar"
 
 
my_switch = Python_Switch()
 
print(my_switch.day(1))
 
print(my_switch.day(3))

Output:

Jan
mar