Python Conditions and If statements

In Python Conditions , the if statement is used for conditional execution. It allows you to execute a block of code only when a specific condition is met. Let’s explore the if, if…else, and if…elif…else statements:

if Statement: –

The basic syntax of an if statement is as follows:

if condition:

    # Code to execute if the condition is True

For Example,

number = 10

if number > 0:

                print ('Number is positive')

if…else Statement

The if…else statement allows you to execute different code blocks based on whether the condition is True or False.

Syntax:

if condition:
     # Code to execute if the condition is True
else:
     # Code to execute if the condition is False

For Example,

number = 10
if number > 0:
    print ('Positive number')
else:
    print ('Negative number')

if…elif…else Statement

When you have multiple conditions to check, you can use the if…elif…else statement.

Syntax: –

if condition1:
          # Code to execute if condition1 is True
elif condition2:
         # Code to execute if condition2 is True
else:
         # Code to execute if none of the conditions are True

For Example: –

number = 10
if number > 0:
    print ('Positive number')
elif number == 0:
    print('Zero')
else:
    print ('Negative number')

Using AND Operator

The and keyword is a logical operator, and is used to combine conditional statements:

For Example

Test if x is greater than y, AND if z is greater than x:

x = 20
y = 3
x = 50
if x > y and z > x:
  print("Both conditions are True")

Using OR Operator

The OR keyword is a logical operator, and is used to combine conditional statements:

For Example,

Test if x is greater than y, OR if x is greater than z:

x = 20
y = 3
x = 50
if x > y or x > z:
  print("At least one of the conditions is True")

Using Not in Python

The not keyword is a logical operator, and is used to reverse the result of the conditional statement:

For Example,

Test if x is NOT greater than y:

x= 33
y= 200
if not x > y:
  print("x is NOT greater than y")

Using Nested If

You can have if statements inside if statements, this is called nested if statements.

For Example,

x = 41
if x > 10:
  print("Above ten,")
  if x > 20:
    print ("and also above 20!")
  else:
    print ("but not above 20.")