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Python elif Keyword

In Python, The elif keyword is used as one of the conditional statements, and it stands for else if. When we have a set of conditional statements to check, we use elif. This keyword must be used along with an if statement, or else it will result in an error.

Following is the syntax of Python eilf keyword −

if condition1:
    statement1
    statement2
elif condition2:
    statement1
    statement2     

Following is a basic example of Python elif keyword −

if False:
    print("This statement is not executed as the given condition is False")
elif True:
    print("This statement is executed as the given condition is True")

Output

Following is the output of the above code −

This statement is executed as the given condition is True

In this example lets try to understand elif keyword when there are more than two condition. The condition mentioned in the if statement is false then eilf statements are to be executed until it reaches the True condition and remaining statements will not be executed −

var1=14
var2=100
if var1>var2:
     print(var1,"is not greater than ",var2)
elif var1==var2:
     print(var1,"is not equal to ",var2)
elif var1<var2:
    print(var1,"is less than ",var2)

Output

Following is the output of the above code −

14 is less than  100

If there are more than one condition to check in a function we can use elif keyword and it will be return a value, if the condition is True.

Lets understand elif keyword in function with an example −

def num(x):
    if x>0:
        print(x,"is a natural number")
    elif x<0:
        print(x,"is an negative number")
    elif x%2==0:
        print(x,"is a even number")
var1=8
num(var1)  
var2=-6
num(var2)

Output

Following is the output of the above code −

8 is a natural number
-6 is an negative number 

The elif keyword is used for additional conditions after an if statement. The elif statement will only be checked if the preceding if statement evaluates to False. Without an if statement, elif cannot be used and will results in SyntaxError.

Lets understand see with an example when elif is used without if statement −

elif True:
    print("This will be not executed")

Output

Following is the output of the above code −

 ERROR!
Traceback (most recent call last):
  File "<main.py>", line 1
    elif True:
    ^^^^
SyntaxError: invalid syntax

If there are multiple else-if statements along with if statement with in a single block of code is known as nested-elif. If there is False condition in the outside elif then the nested-elif block will not be executed.

Here, is an example for nested elif. In the if statement we have given a False condition so nested elif block is executed−

if False:
    print("Hello World")
    if True:
        print("Welcome to Tutorials Point")
    elif True:
        print("Lets Learn Python")
elif True:
    print("Hello")
    if False:
        print("Welcome")
    elif True:
       print("Tutorials Point")

Output

Following is the output of the above code −

Hello
Tutorials Point

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