Iteration or Looping statements || Python for beginners

Iteration or Looping statements

Loop statement allows us to execute a statement or group of statement multiple times.

It is used to execute more times the same set of operations within the loop. It is also known as iteration.

Python provides three conditional looping statements. They are

• For loop
• While loop
• Nested loop

For loop

The for loop repeats a given block of codes by specified number of times. It is used to print the values one by one.

Syntax:

for iterating variable in sequence:

    body of for

Flowchart

Example

Number=[1,2,3,4,5]

for i in Numbers:

     print(“The current number is:”, i)

Output

The current number is: 1

The current number is: 2

The current number is: 3

The current number is: 4

The current number is: 5

Example 

for letter in “python”:

     print(“The current letter  is:”, letter)

Output

The current letter is: p

The current letter is: y

The current letter is: t

The current letter is: h

The current letter is: o

The current letter is: n

While loop

It repeats a single statement or group of statements until some condition is met. It tests the condition before executing the loop body

Syntax:

while test expression:

    body of while

Flowchart

Example 

count = 1

while count<5: 

    print(“The count is:”, count)

    count=count+1

Output

The count is: 1

The count is: 2

The count is: 3

The count is: 4

Nested for loop

Syntax:

for iterating variable in sequence:

    for iterating variable in sequence:

        body of for

    body of for

Nested While loop

Syntax:

while test expression:

    while test expression:

        body of while

    body of while