Sometimes, the programmer may want to evaluate more than one condition. This can be done using an elif statement.

An elif statement works on the following principle:

• Execute the block of code inside the if statement if the initial expression evaluates to True. After execution, return to the code outside the if block.
• Execute the block of code inside the first elif statement if the expression inside it evaluates to True. After execution, return to the code outside the if block.
• Execute the block of code inside the second elif statement if the expression inside it evaluates to True. After execution, return to the code outside the if block.
  • ...
• Execute the block of code inside the nth elif statement if the expression inside it evaluates to True. After execution, return to the code outside the if block.
• Execute the block of code inside the else statement if none of the expressions evaluate to True. After execution, return to the code outside the if block.

Example:

num = 0
if (num < 0):
    print("Number is negative.")
elif (num == 0):
    print("Number is Zero.")
else:
    print("Number is positive.")

Output:

Number is Zero.