Python’s “if” declarations – Python Morsels

Allowed’s speak about if declarations in Python

Conditional code with if declarations

If you wish to run some code just if a specific problem is satisfied, you can make use of an if declaration.

Right Here we have a program called language.py:

 worth  =  input(" What shows language are you discovering? ")

 if  worth = = " Python": 
     print(" Trendy! This program was created in Python.")

In this program, we’re motivating a customer to go into a worth, and afterwards we’re publishing out an action just if the worth that they got in is Python:

$ python language.py
What shows language are you discovering? Python
Trendy! This program was created  in Python.

If they go into anything else, we do not do anything:

$ python language.py
What shows language are you discovering? JavaScript

We’re utilizing an if declaration to do this.
The if declaration has a problem, and also if that problem holds true, the block of code following that problem is run

Utilizing else with if in Python

Suppose we wished to publish out a various action when our problem isn’t satisfied?
For that, we might make use of an else declaration

An else declaration likewise follows an if:

 worth  =  input(" What shows language are you discovering? ")

 if  worth = = " Python": 
     print(" Trendy! This program was created in Python.")
 else: 
     print( f" Neat. I have not attempted  { worth}  yet.")

When the problem we’re examining holds true, we run the block of code right after the if declaration (the very first print line).

$ python language.py
What shows language are you discovering? Python
Trendy! This program was created  in Python.

Or else, we run the block of code following the else declaration (the secondly print line).

$ python language.py
What shows language are you discovering? JavaScript
Cool. I place' t attempted JavaScript yet.

Our program currently constantly carries out an activity, however the activity will be various depending upon the worth the individual offered:

Inspecting several problems with elif

Suppose we had a selection of various problems that we wished to examine together, up until among them held true?
We might make use of elif declarations for that.

This light.py program publishes out a shade of light based upon an arbitrarily created wavelength:

 from  arbitrary  import  randint

 wavelength  =  randint( 390,  780)

 print( f" { wavelength}  nm wavelength")
 if  wavelength <