1. Introduction to programming with Python
Faiza Qadri
Graduate Student,Department of Engineering,SSU
Society of Women Engineering
Session:01

2. Languages

3. Why is it important
Python started as a scripting language for Linux like Perl but less cryptic. Now it is used for both web and desktop applications and is available on Windows too.
According to IEEE Spectrum,its one of the top 5 software languages
Must have skill for a Software Engineer!
One of the official languages at Google
NASA uses Python! (
Courses it is useful in:Wireless Systems,Networking,Analog & Digital Systems

5. A little History
Python programming language was created by Guido Van Rossum in 1991 at at the National Research Institute for Mathematics and Computer Science in the Netherlands.
The inventor is a fan of "Monty Python's Flying Circus", a comedy series from the seventies.
Python is derived from many other languages, including C, C++, SmallTalk, and Unix shell and other scripting languages.
Its design philosophy emphasizes code readability

6. Key Features
Python is a high-level,interpreted,interactive and object-oriented scripting language
Python is Interpreted:Similar to PERL and PHP
Many languages require you to compile (translate) your program into a form that the machine understands.
Python is instead directly interpreted into machine instructions.
compile
execute
output
source code
Hello.java
byte code
Hello.class
interpret
output
source code
Hello.py

7. Key Features Python is Interactive Python is Object-oriented
Python is a Beginner's Language

8. Lets get started!!
Python Official Website :

9. Program #1 (Input ,Print)
Input: Reads a number from user input.
You can assign (store) the result of input into a variable.
Example:
age = input("How old are you?”)
n=eval(input(‘enter the input’))
print (“Your age is", age)
print (“You have", 65 - age, "years until retirement”)
print : Produces text output on the console.
Syntax:
print (“Message”)
print (Expression)
Program # Number Game:Program that takes any 2-digit number and outputs a 6-digit number,having the 2-digit repeated.For-example,24 becomes

10. Math commands Python has useful commands for performing calculations.
To use many of these commands, you must write the following at top of your Python program:
import math
Command name
Description
abs(value)
absolute value
ceil(value)
rounds up
cos(value)
cosine, in radians
floor(value)
rounds down
log(value)
logarithm, base e
log10(value)
logarithm, base 10
max(value1, value2)
larger of two values
min(value1, value2)
smaller of two values
round(value)
nearest whole number
sin(value)
sine, in radians
sqrt(value)
square root
Constant
Description e pi

11. Program #2 Program #02 Saving Interest Program
Concepts:String Formatting,Functions,Modules

12. Branching
Branching
A program should be able to execute different statements depending on calculations or users input.
If-else
if expression:
statements
else:
Statements if expression is false
Statements here execute after the if-else.
Multiple if-else,Use elif i if condition:
elif condition:
Program #3 Tweet Decoder:Write a program that decodes a few common abbreviations (tweets) or and provides the corresponding English Phrase.

13. Lists & Dicts
A list is a container, which is an object that groups related objects together.
A list is also a sequence; thus, the contained objects maintain a left-to-right positional ordering.For example list1 = ['physics', 'chemistry', 1997, 2000]; list 2=[1,2,3,4,5]; list3 = [“a”,“b”,“c”,“d”]
List Methods:list.append(x) , list.insert(i,x) , list.remove(x), list.pop(0)
A dictionary is another sort of type of container
Dictionaries contain references to objects as key-value pairs – each key in the dictionary is associated with a value .For-example dict = {'Alice': '2341', 'Beth': '9102', 'Cecil': ‘3258'} dict1 = { 'abc': 456 }; dict2 = { 'abc': 123, 98.6: 37 };

14. Program
Extract IP address program

15. Loops
Programmer can use a loop that executes the same code over and over again as long as some condition is true.
While Loop
while expression: # Loop expression
# Loop body: Sub-statements to execute...
# if the loop expression evaluates to True...
# Statements to execute after the expression evaluates to False

16. Loops For Loop Syntax for variable in container:
# Loop body: Sub-statements to execute
# for each item in the container
# Statements to execute after the for loop is complete
Example:Square of a Number:
for x in range(1, 6): print (“squared is", x * x)
Program #4 Write a program to find the Factorial of a number(Use While or For Loop)’
Notes:2 things about loops:No of times we want to run the loop,There has to be an exit condition

17. Nested Loops Loop inside a loop
Program#05 Write a program that uses a nested for- loop to find the prime numbers from 2 to 100

18. Program #06 Phone Number Program
Program allows the user to enter a phone number that includes letters, which appear on phone keypads along with numbers, as is commonly used by companies as a marketing tactic (e.g., HOLIDAY). The program then outputs the phone number using numbers only.

19. Continued..
Session :02
OOP