The Python If Else Statement is an extension to the Python 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 the If Else statement in Python:
Python If Else Statement Syntax
The syntax of the Python If Else Statement is as follows:
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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 and 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, if the condition is false then False statements will be executed.
TIP: By clicking backspace you can exit from the If Else statement block
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
Once you click on the New File, new file window will be opened to write Python script. Please add the following script in that new file
PYTHON CODE
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# 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
Please save the file as per your requirements
Once you save the file, Let us run the script and see by selecting Run Menu and click on Run Module or simply click F5
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.
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.
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
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marks = int(input(" Please Enter Your Subject Marks: ")) |
If you look at the below if statement, If Value stored in the marks variable is greater than or equal to 50 then following print statement will be executed.
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if marks >= 50: print(" Congratulations ") #s1 print(" You cleared the subject ") #s2 |
If Value stored in the marks variable is less than 50 then following print statement (inside the Else block) will be executed.
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print(" You Failed") #s3 print(" Better Luck Next Time") #s4 |
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