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Python Theory

Conditional Statements (Decision Making):

  • The decision is described to the computer as a conditional statement that can be answered True or False.
  • Python language provides the following conditional(Decision making) statements.

    • if statement:

  • The if statement is a decision making statement.
  • It is used to control the flow of execution of the statements and also used to test logically whether the condition True or false.
    • Syntax
    if test expression:
    statement(s)
    Example
    a=int(input("Enter the number:"))

    if (a<=10 ):
    print(" Condition is True")
    Output
    SkillPundit: Python-Conditional-Statement_if-Statement

    If else statement :

    The if else statement is called alternative execution, in which there are two possibilities and the condition determines which one gets executed.

    Syntax
    if test expression:
    statement(s) else:
    statement(s)
    Example
    a=int(input("Enter the number:"))

    if (a<=10 ):
    print(" Condition is true") else: print(" Condition is Flase")

    elif statements:

  • elif - is a keyword used in python in replacement of else if to place another condition in the program.This is called chained conditional.
  • Chained conditions allow more than two possibilities and need more than two branches.
    • Syntax
    if expression:
    Body of if elif expression:
    Body of elif else:
    Body of else
    Example
    a=int(input("Enter the number:"))
    b=int(input("Enter the number:"))
    c=int(input("Enter the number:"))
    if (a>b ) and (a>c ):
    print(" a is greater")
    elif (b>a ) and (b>c ):
    print(" b is greater")
    else: print(" c is greater")

    Nested if statement:

  • We can write an entire if.. else statement in another if..else statement called nesting, and statement is called nested if.
  • In a nested if construct, you can have an if..elif..else construct inside an if elif else construct.
    • Syntax
    if expression1:
    statement(s) if expression2:
    statement(s) elif expression3:
    statement(s) else:
    statement(s)
    Example
    n=int(input("Enter the number:"))
    if (n<=15 ):
    if (n==10 ): print(" Play Cricket") else: print(" Play kabadi")
    else print(" Don't play game")
    Output
    SkillPundit: Python-Conditional-Statement_if-Statement