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Alternative to switch, case and default
Conditionals and Loops example from a Well House Consultants training course
More on Conditionals and Loops [link]

This example is described in the following article(s):
   • What - no switch or case statement? - [link]

Source code: python_switch_case Module: Y103

""" There is no switch or case in Python ... because you can
do better by using its OO capabilities and a dictionary. """


def doblue (): print("The sea is blue")
def dogreen (): print("Grass is green")
def doyellow (): print("Sand is yellow")

def redflag ():
   print("Red is the colour of fire")
   print("do NOT play with fire")

def errhandler ():
   print("Your input has not been recognised")

# set up a dictionary of actions

takeaction = {
    "blue": doblue,
    "green": dogreen,
    "yellow": doyellow,
    "red": redflag}

# Following line raw_input in Python 2
colour = input("Please enter red blue green or yellow ")
takeaction.get(colour,errhandler)()

# Uses the get method to allow us to specify a default

""" Sample output:

WomanWithCat:y103 grahamellis$ python3 python_switch_case
Please enter red blue green or yellow red
Red is the colour of fire
do NOT play with fire
WomanWithCat:y103 grahamellis$ python3 python_switch_case
Please enter red blue green or yellow blue
The sea is blue
WomanWithCat:y103 grahamellis$ python3 python_switch_case
Please enter red blue green or yellow brown
Your input has not been recognised
WomanWithCat:y103 grahamellis$

"""

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Conditionals and Loops" training module. You'll find a description of the topic and some other closely related examples on the "Conditionals and Loops" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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