Python programming workshop session 2

Faculty of Engineering Science & Technology(FEST)
Hamdard Institute of Engineering Technology(HIET)
HAMDARD UNIVERSITY
Instructor
ABDUL HASEEB
HANDS-ON WORKSHOP ON PYTHON
PROGRAMMING LANGUAGE
Faculty Development Program (Session-10)
DAY-2

The Python Programming Language
Day 2 Workshop Contents
• range function
• Indentation in Python programming
• Loops
• for loop
• while loop
• Conditional statement
• if statement
• elif statement
• Modules of Math, Time and Random variable

Indentation
• Python uses whitespace
indentation to delimit
blocks – rather than curly
braces { code } or keywords
begin code end. An increase
in indentation comes after
certain statements followed
by colon( : ); a decrease in
indentation signifies the end
of the current block. This
feature is also sometimes
termed the off-side rule.

The range() function
The built-in function range() is the right
function to iterate over a sequence of
numbers. It generates an iterate of arithmetic
progressions

• range(stop) -> list of integers
>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
• range(start, stop) -> list of integers
>>> list(range(2,10))
[2, 3, 4, 5, 6, 7, 8, 9]
• range(start, stop, step) -> list of integers
>>> list(range(2,10,3))
[2, 5, 8]
The range() function

for loop
For loop is use to repeat a part of code
to the defined number of time
Syntax:
for iterating_variable in sequence:
. . . . . . . . . . .statements(s)
The iterating_variable may be int or
string and automatically update to the
type of sequence

Program
for i in range(10):
print('Hamdard University')
Output
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
Hamdard University
for loop example

For loop with integer sequence
a=10
for i in range(a):
print(i)
0
1
2
3
4
5
6
7
8
9
a=10
for i in range(a):
print(a)
10
10
10
10
10
10
10
10
10
10

For loop with different range()
function sequence
for loop starting from 0 and
run until define limit
reaches
Declaring for loop starting
value and run in define limit
Declaring loop starting, final
and difference value
for i in range(10):
print('The value is ',i)
for i in range(3,10):
for i in range(3,10,2):
The value is 0
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5
The value is 6
The value is 7
The value is 8
The value is 9
The value is 3
The value is 4
The value is 5
The value is 6
The value is 7
The value is 8
The value is 9
The value is 3
The value is 5
The value is 7
The value is 9

for Loop Exercise 1
Generate Table of the user enter number
Output will look like this:
Enter a Number = 2
2 x 1 = 2
2 x 2 = 4
. . . . . .
2 x 10 = 20

for Loop Exercise 1 Solution
num = input("Enter a number = ")
for i in range(1,11):
print(num,' x ',i,' = ',int(num)*i)
Enter a number = 6
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

for Loop Exercise 2
Write a program which generates values of
Sinθ from 0ᴼ to 360ᴼ with the gap 10ᴼ
Output will look like this:
Sin(0) = 0
Sin(10) = 0.17364
Sin(20) =0.34202
. . . . . . .
Sin(360) = 0

import math
from math import sin
for i in range(0,361,10):
print('sin(',i,')',math.sin(math.radians(i)))
sin( 0 ) 0.0
sin( 10 ) 0.17364817766693033
sin( 20 ) 0.3420201433256687
sin( 30 ) 0.49999999999999994
sin( 40 ) 0.6427876096865393
sin( 50 ) 0.766044443118978
sin( 60 ) 0.8660254037844386
sin( 70 ) 0.9396926207859083
sin( 80 ) 0.984807753012208
sin( 90 ) 1.0
. . . . . .
For Loop Exercise 2 Solution

Decision Making statement
• Decision making check the
conditions occurring while
execution of the program
and take actions according to
the given conditions.
• Decision structures evaluate
multiple expressions which
produce TRUE or FALSE as
outcome. If the condition is
TRUE then condition code
will run and if it FALSE then
the conditional code will by-
pass it.

Where to use if and where elif(else if)
if(condition)
condition code
if(condition)
condition code
if(condition)
condition code
if(condition)
condition code
if(condition)
condition code
elif(condition)
condition code
elif(condition)
condition code
elif(condition)
condition code
Multiple outcomes Only Single outcomes

If else condition exercise solution
num = int(input("Enter a number = "))
if num%2==0:
print('The number',num,'is divisible by 2')
if num%3==0:
if num%5==0:
else:
print("the num you entered is prime")
Enter a number = 6
The number 6 is divisible by 2
The number 6 is divisible by 3

If else condition exercise solution
obtain_marks= int(input("Enter obtain marks = "))
total_marks = int(input("Enter total marks = "))
percentage = (obtain_marks/total_marks)*100
print("The percentage is = ", percentage)
if percentage>90:
print('The Grade is A+')
elif percentage>80:
print('The Grade is A')
elif percentage>70:
print('The Grade is B')
elif percentage>60:
print('The Grade is C')
elif percentage>50:
print('The Grade is D')
else:
print('Fail')
Enter obtain marks = 65
Enter total marks = 100
The percentage is = 65.0
The Grade is C

While loop
• While loop is a conditional
loop
• The code run until the
condition remain True and
escape if when condition
become False
Simply:
while loop = for loop + if else

write for loop using while loop
a=0
while(a<10):
print('Karachi',a)
a += 1 # a = a + 1
Karachi 0
Karachi 1
Karachi 2
Karachi 3
Karachi 4
Karachi 5
Karachi 6
Karachi 7
Karachi 8
Karachi 9

Example While loop
The following program take a character from user and show its ASCII
number. The program continue to run until user press TAB Key
a=0
while(a!=‘t’):
a = input("Enter a key, press Tab key to exit = ")
print('ASCII of',a,'is ',ord(a))
Enter a key, press Tab key to exit = f
ASCII of f is 102
Enter a key, press Tab key to exit = g
ASCII of g is 103
Enter a key, press Tab key to exit =
ASCII of is 9

Infinite Loop
Infinite loop run continuous and did not exit. The infinite
loop can be made by while loop with condition set to
‘True’ which mean the loop never become false and
never exit from while code block.
Syntax:
while True:
……….execute this code continuously to infinite time
Note this is infinite loop which never end to break the
infinite loop press Ctrl + c

While loop Exercise
• Write a program which print your name to
infinite time with delay of 1 sec.
HAMDARD UNIVERSITY
delay(1sec)
HAMDARD UNIVERSITY
delay(1sec)
HAMDARD UNIVERSITY
delay(1sec)
HAMDARD UNIVERSITY
delay(1sec)
. . . . . .

while loop Exercise Solution
import time
from time import sleep
while(True):
print('HAMDARD UNIVERSITY')
sleep(1)
HAMDARD UNIVERSITY
HAMDARD UNIVERSITY
HAMDARD UNIVERSITY
HAMDARD UNIVERSITY
. . . . . .

Logical operator in Python
Operator Description Example
and Logical
AND
If both the operands are
true then condition
becomes true.
(a and b) is true.
or Logical
OR
If any of the two operands
are non-zero then
condition becomes true.
(a or b) is true.
not Logical
NOT
Used to reverse the logical
state of its operand.
Not(a and b) is false.

For loop – if else example
msg = input("Enter a string = ")
for i in msg.lower():
if(i == 'a' or i =='e' or i == 'i'or i == 'o'or i == 'u'):
print(i , 'is vovel' )
else:
print(i , 'is not vovel' )
Enter a string = Hamdard
h is not vovel
a is vovel
m is not vovel
d is not vovel
a is vovel
r is not vovel
d is not vovel

Comparing Python with C/C++
Programming Parameter Python Language C/C++ Language
Programming type Interpreter Compiler
Programming Language High level Language Middle level Language
Header file import #include
Code block Whitespace Indentation
Code within curly bracket
{ code}
Single line statement
termination
Nothing Semicolon ;
Control flow (Multi line)
statement termination
Colon : Nothing
Single line comments # comments //comments
Multi-line comments
‘’’
Comments lines
‘’’
/*
Comments lines
*/
If error code found Partial run code until find error
Did not run until error is
present
Program length Take fewer lines Take relatively more lines

Python Programming code comparison with C
programming code
Python program C/C++ program
Multi-line comments
Including library
Declaring variable
Multi-line statement
Code Block
Single-line statement
Single line comments
‘’’ The Python Language
Example code ’’’
Import time
a=10 #integer value
name = 'karachi' #String
for i in range (a):
print("Hamdard")
print('University')
print(name)
#program end
/* The C/C++ language
Example code */
#include <iostream>
using namespace std;
int main()
{
int a = 10;
char name[10] = "Karachi";
for(int i =0 ; i <a ; i ++ )
{
cout<<"Hamdard ";
cout<<"University"<<endl;
}
cout<<name;
return 0;
}
//program end

Python programming workshop session 2

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Python programming workshop session 2