CONTROL STRUCTURES

Python Control Structures

Python Control Structures are Selection Statements and Iterative Statements

Selection Statements: if statement, if-else statement, if-elif-else statement, nested-if statement.

Iterative Statements: while loop, for loop, break statement, continue statement, pass and else statements used with loops.

 

if statement

if statement is used to test a specific expression. If the expression is true, a block of code (if-block) will be executed. The expression is any valid logical condition which can be either evaluated to true or false.

Syntax

•       if expression:  

            Set of statements  

If statemet

If-else statement

When “if statement “ is false, then the else statement will be executed.

 

•       Syntax

if expression:  

    #set of statements   

else:   

  #another set of statements (else-block)   

if-else statemet

if-elif-else statement

 

The elif statement is used  to check multiple expressions and execute the specific block of statements depending upon the true condition among them.

Syntax

if expression 1:   

   # set of statements   

elif expression 2:   

    # set of statements    

elif expression 3:   

    # set of statements   

else:   

    # set of statements  

Nested-if statement

if statements inside if statements is called nested if statements.

•       syntax

if exp:

  Statemets

If exp2:

Statements

Else: 

statemets