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Python If Else

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The Python If Else Statement is an extension to the If Statement (which we discussed in the earlier post). We already seen the If statement, it will only executes the statements when the given condition is true and if the condition is false, it will not execute statements.

In real world, it would be nice to execute something when the condition fails. To do so, If else statement is used. Here, Else statement will execute the statements when the condition fails. Let us see the syntax of If Else statement in Python:

Python If Else Syntax

The syntax of If Else Statement in Python is as follows:

if (Test condition):
     # If the condition is TRUE then these statements will be executed
     True statements
else
     # If the condition is FALSE then these statements will be executed
     False statements

NOTE: Once you hit the enter after semicolon, python will start the next statement with Tab space. This Tab space acts as curly braces ({ }) in other programming languages.

If the test condition present in the above structure is true then True statements will be executed, otherwise, False statements is executed.

TIP: By clicking backspace you can exit from the Python If Else statement block

Flow Chart for Python If Else Statement

The flow chart of the Python If else statement is as shown below

Flow Chart for Python If Else Statement

Python If Else Statement Example

In this program we are going to place 4 different print statements. If the condition is true we will print 2 different statements, if the condition is false we will print another 2 statements using Python if else statement. First, Please open your favorite IDLE to write Python script and here we are using Python 3.5.0.

Once you open Python IDLE, Please select the New File as shown in the below screenshot or else simply click Control + N

Python If Else Statement 0

Once you click on the New File, new file window will be opened to write script. Please add the following script in that new file

PYTHON CODE

# Example for Python If Else Statement

marks = int(input(" Please Enter Your Subject Marks:  "))
if marks >= 50:
    print(" Congratulations ") #s1
    print(" You cleared the subject ") #s2
else:
    print(" You Failed") #s3
    print(" Better Luck Next Time") #s4

Once you are done, Click on the File Menu and select Save option as shown below

Python If Else Statement 1

Please save this file as per your requirements

Python If Else Statement 2

Once you save the file, Let us run the script and see by selecting Run Menu and clicking the Run Module or simply click F5

Python If Else Statement 3

Once you click on Run Module, Our Python shell will pop up with message “Please Enter Your Subject Marks:” .

OUTPUT 1: From the below screenshot you can observe that we enter 60 as marks, which is greater than 50 that’s why it printed (s1 and s2 statement) inside the If statement block.

Python If Else Statement 4

OUTPUT 2: Let us see what happens when we enter less than 50. From the below screenshot you can observe that we enter 30 as marks. It means Condition is FALSE so, s3 and s4 statements inside the else block will be printed as output.

Python If Else Statement 5

ANALYSIS

First, we declared marks variable and asks the user to enter any integer value. int() restrict the user not to enter non integer values

marks = int(input(" Please Enter Your Subject Marks:  "))

If you look at the python if else statement, If Value stored in the marks variable is greater than or equal to 50 then following print statement will be executed.

if marks >= 50:
    print(" Congratulations ") #s1
    print(" You cleared the subject ") #s2

If it is less than 50, below statement (inside the Else) will be executed.

 print(" You Failed") #s3
 print(" Better Luck Next Time") #s4

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