Python Conditional statement

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Python Conditional statement

If Statement

The If statement is the most fundamental decision-making statement, in which the code is executed based on whether it meets the specified condition. It has a code body that only executes if the condition in the if statement is true. The statement can be a single line or a block of code. The if statement in Python has the subsequent syntax: if expression Statement

Code :

 num = 5
 if num > 0:
 if num > 0:
 print(num, "is a positive number.")
 print(num, "is a positive number.")
 print("This statement is true.")
 print("This statement is true.")
 #When we run the program, the output will be:
 #When we run the program, the output will be:
 5 is a positive number.
 5 is a positive number.
 This statement is true.
 This statement is true

If and else Statement

This statement is used when both the true and false parts of a given condition are specified to be executed. When the condition is true, the statement inside the if block is executed; if the condition is false, the statement outside the if block is executed. The if… Else statement in Python has the following syntax: if condition : #Will executes this block if the condition is true else : #Will executes this block if the condition is false

Code :

 num = 5
 if num >= 0:
 if num >= 0:
 print("Positive or Zero")
 else:
 print("Positive or Zero")
 else:
 print("Negative number")
 print("Negative number")
 output : Positive or Zero

If , elif and else condition

In this case, the If condition is evaluated first. If it is false, the Elif statement will be executed; if it also comes false, the Else statement will be executed. The If…Elif..else statement in Python has the subsequent syntax: if condition : Body of if elif condition : Body of elif else: Body of else

Code :

num = 7
 num = 7
 if num > 0:
 if num > 0:
 print("Positive number")
 print("Positive number")
 elif num == 0:
 elif num == 0:
 print("Zero")
 print("Zero")
 else:
 else:
 print("Negative number")
 print("Negative number")
 output:  Positive number
 output:  Positive numbe

Nested If Statement

A Nested IF statement is one in which an If statement is nestled inside another If statement. This is used when a variable must be processed more than once. If, If-else, and If…elif…else statements can be used in the program. In Nested If statements, the indentation (whitespace at the beginning) to determine the scope of each statement should take precedence.

Code :

 price=100
 quantity=10
 quantity=10
 amount = price*quantity
 amount = price*quantity
 if amount > 200:
 if amount > 200:
 if amount >1000:
 if amount >1000:
 print("The amount is greater than 1000")
 print("The amount is greater than 1000")
 else:
 else:
 if amount  800:
 if amount  800:
 print("The amount is between 800 and 1000")
 print("The amount is between 800 and 1000")
 elif amount  600:
 elif amount  600:
 print("The amount is between 600 and 1000")
 print("The amount is between 600 and 1000")
 else:
 else:
 print("The amount is between 400 and 1000")
 print("The amount is between 400 and 1000")
 elif amount == 200:
 elif amount == 200:
 print("Amount is 200")
 print("Amount is 200")
 else:
 else:
 print("Amount is less than 200")
 print("Amount is less than 200")
 The output : “The amount is between 400 and 1000.”
 The output : “The amount is between 400 and 1000.