Python if...else Statement

In this article, you will learn how to make Python program decisions using different formats to explain if..else.

Table of Contents

• What are if...else statement in Python?
• Python if Statement Syntax
• Python if Statement Flowchart
• Example: Python if Statement
• Python if...else Statement
• Syntax of if...else
• Python if..else Flowchart
• Example of if...else
• Python if...elif...else Statement
• Syntax of if...elif...else
• Flowchart of if...elif...else
• Example of if...elif...else
• Python Nested if statements

What are if ... else statement in Python?

Making important decisions when we want to perform a code only if certain conditions are met.

If ... Elif ... Python has used to reach decision makers.

if test expression:

    statement(s)

 Python if Statement Syntax:

Then the program evaluates the performance test by completing the text (s) only if the text is correct.

If the text is false, the text (s) is not enforced.

In Python, you know that it is referred to as the stream. The staff begins with an indication of ending without advance.

Python interprets the value of zero without real value. None of the 0 was interpreted as false.

Python if statement Flowchart:

                                                     

Example: Python if Statement

# If the number is positive, we print an appropriate message

 num = 3

if num > 0:

    print(num, "is a positive number.")

print("This is always printed.")

 num = -1

if num > 0:

    print(num, "is a positive number.")

print("This is also always printed.")

When you run the program, the output will be:

3 is a positive number

This is always printed

This is also always printed. 

Python if...else Statement:

Syntax of if...else

if test expression:

    Body of if

else:

   Body of else

If it does not, the value of the test scores will be carried out when the body is only if the test is accurate.

If the situation is fake, the body of another is carried out. Mediation is used in different parts.

Python if..else  flowchart:

                                                    

                                                        

Example of if...else

# Program checks if the number is positive or negative

# And displays an appropriate message 

num = 3

 # Try these two variations as well.

# num = -5

# num = 0

if num >= 0:

    print("Positive or Zero")

else:

    print("Negative number")

Python if...elif...else Statement

Syntax of if...elif...else

if test expression:

    Body of if

elif test expression:

    Body of elif

else:

    Body of else

In the previous example, when NUM and 3, and experimental samples were performed in the other body, they were deleted.

NUM is equal to -5, the test score is a false passage that includes the body must be removed.

NUM corresponds to 0, the correct revelation, and if it is done it tastes the other body.

Flowchart of if...elif...else

                                      

Example of if...elif...else

Python if famous

We can afford if ... there is ... someone else inside if ... elif ... else. This is called a computer program.

# In this program,

# we check if the number is positive or

# negative or zero and

# display an appropriate message

 num = 3.4

 # Try these two variations as well:

# num = 0

# num = -4.5

 if num > 0:

    print("Positive number")

elif num == 0:

    print("Zero")

else:

    print("Negative number")

Python Nested if statements:

All these statements can be constructed among each other. Sangria is the only way to know the level of rubbish. This can be frustrating, so it should be avoided if we can.

# In this program, we input a number

# check if the number is positive or

# negative or zero and display

# an appropriate message

# This time we use nested if

num = float(input("Enter a number: "))

if num >= 0:

    if num == 0:

       print("Zero")

   else:

        print("Positive number")

else:

    print("Negative number")

Output 1:

Enter a number: 5

Positive number

Output 2:

Enter a number: -1

Negative number

Output 3

Enter a number: 0

Zero

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