iteration in python

1. NAME: Keshav Bandil
Branch: AI&DS (2nd Year)
Self Learning Presentation On: DSA using Python
Topic : ITERATION

2. A loop statement allows us to execute a statement
or group of statements multiple times.
Looping statements

3. Types of Looping statements
For loop
While
loop
Nested
loop

4. The for loop in python is
used to iterate
statements or part
the
of
the program several
times.
used
It
to
is frequently
traverse the
data structures like list,
tuple, or dictionary.
For Loop

6. for [variable] in [iterable]:
[statements]
Syntax

7. Write a
program to
print 1 to 10
series
Example
i=1
For i in range(1,11):
Print(i)
Output
1 2 3 4 5 6 7 8 9 10

8. To print
multiplication table
Output
enter no 6
6 X 0 = 0
6 X 1 = 6
6 X 2 = 12
6 X 3 = 18
6 X 4 = 24
6 X 5 = 30
6 X 6 = 36
6 X 7 = 42
6 X 8 = 48
6 X 9 = 54
6 X 10 = 60
i=0
n=int(input("enter no"))
for i in range(0,11):
print("%d X %d = %d" %
(n,i,n*i))

9. Program
to
Iterating
string
using for
loop
Example Output
P
str = "Python"
Y
for i in str:
T
print(i)
H
O
N

10. Repeats a statement or
group of statements while
a given condition is TRUE. It
tests the condition before
executing the loop body.
While loop syntax
while (
test_expression):
Body of while

11. Flow chart

12. Output
1
2
3
4
5
Program to
print 1 to 5
series
Example
i = 1
while i < 6:
print(i)
i += 1

13. Example
a = ['student1', 'student2',
'student3']
while a:
item = a.pop(-1)
print(item)
Output
student3
student2
Student1
Program to print list in reverse order

14. n=10
while n > 0:
n -= 1;
if True:
print(n)
Output
Example
Using if Statement with While Loop
10
9
8
7
6
5
4
3
2
1

15. Python supports to have
an else statement associated with a
loop statement.
If
a
the else statement is used with
while loop, the else statement is
executed when the condition becomes
false.
Using else Statement with While Loop

16. while expr:
statement(s)
else:
additional_statement(s)
Syntax

18. Nested loop
You can use one or more
loop inside any another
while, for loop

21. Enter therows"))