Python programming language

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Python Programming
Unit-1

2. Introduction of Python
History Python:
 High-level, interpreted programming language
 Designed for simplicity and readability
 Developed by Guido van Rossum
 1980s – Work began on a new language
 1989 – Guido started implementation during Christmas
 1991 – Python 0.9.0 released
 2000 – Python 2.0 released (List comprehension, garbage collection)
 2008 – Python 3.0 released (not backward-compatible)
 Now – Python is among the most popular languages

3. Introduction of Python
Feature of Python:
 Simple & Easy to Learn
 Free and Open Source
 High-level Language
 Interpreted Language
 Platform Independent
 Large Standard Library
 Object-Oriented
 Extensible and Embeddable

4. Introduction of Python
Installing Python and Setting Up the Environment :
 Downloading Python
 Visit: www.python.org
 Click on Downloads
 Choose version (recommend: Python 3.x)
 Download for Windows/Mac/Linux

5. Introduction of Python
Why Python?
 Python works on different platforms (Windows, Mac, Linux, etc).
 Python has a simple syntax similar to the English language.
 Python has syntax that allows developers to write programs with fewer lines
than some other programming languages.
 Python runs on an interpreter system, meaning that code can be executed
as soon as it is written. This means that prototyping can be very quick.
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6. Introduction of Python
Basic Syntax and Structure of a Python Program
 What is Syntax?
 Syntax = Rules for writing Python code
 Similar to grammar in a language
 Python is known for clean and readable syntax
Basic Structure of a Python Program
print("Hello, World!")
 No need of main() function
 Code runs from top to bottom

7. Introduction of Python
Operators in Python: What are Operators?
 Operators are symbols used to perform operations on variables and values
 Python has different types of operators
Operator Meaning Example
+ Addition a + b
- Subtraction a - b
* Multiplication a * b
/ Division a / b
// Floor Division a // b
% Modulus a % b
** Exponent a ** b
Arithmetic Operators

8. Introduction of Python
Logical Operators
Operator Meaning Example
and True if both true a > 2 and a < 10
or True if any one true a < 2 or a > 5
not Reverses the result not(a > 3)

9. Introduction of Python
Assignment Operators
Operator Meaning Example
= Assign value x = 10
+= x = x + 5 x += 5
-= x = x - 3 x -= 3
*= x = x * 2 x *= 2
/= x = x / 2 x /= 2

10. Introduction of Python
#Simple Python Program
name = input("Enter your name: ")
age = int(input(“Enter your age”))
print("Hello", name)
print(“You are “, age, “years old.”)
Output:
Hello JohnYou are 25 years old. Top of Form
Bottom of Form
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