This document provides an introduction to the Python programming language. It discusses that Python is an interpreted, object-oriented language created by Guido van Rossum in 1990. It then covers Python's core features like being free and open source, rapid prototyping, portability, powerful standard libraries, and more. The document also summarizes Python's basic data types, control structures like if/else statements and loops, functions, file handling, classes and inheritance.

1. By
Karthik Prakash

2. • Introduction to Python
• Interactive “Shell”
• Basic Types and Containers
• Control Structures

3. “Remarkable power with very clear syntax”
Python is an Interpreted, Object Oriented
Programming language.
…it’s named after a television series Monty Python’s
Flying Circus
It was created by Guido Van Rossum in the year
1990…

4. Features :-
• Free and Open Source… Maintained by the PSF (Python Software
Foundation)
• Rapid Prototyping
• Compiled to interpreted byte code .. sometimes called as Scripting
language
….i.e Compilation is implicit
• Indentation for block structure
…“Life's better without braces(Bruce Eckel)”
• Extremely Portable (Windows,Linux,Unix,Mac… etc)
• Powerful Standard libraries

5. Two variations: IDLE (GUI) and PYTHON (command line)
• Most Python implementations work on CLI (Command Line Interface)
• Great for learning the language by experimenting with the library
• Great for testing your own modules
• Benefits of IDLE
• Multi Windows Text Editor
• Interactive Command Shell
• Syntax Highlighting
• Auto-Indentation
• Auto Completion extended to Intellisence

6. • None
• Numbers and Floats
• Complex Numbers …. (i + j)
• Floating point
• Boolean…. True or False
• “Strings”
• u“Unicode”
• Tuples ()
• Lists []
• Dictonaries {}
• Built-in Function “type()”

7. • If, else, elif….
• Try and except
• While Loop
• For Loop

8. • List Comprehension
• Functions
• Doc Strings
… Smart way of Documenting modules
• File Handling
…… read , write , append to file

9. Single
[ <item operation> for item in sequence <if condition>]
Nested
Special care has to be taken for the nested list
comprehension:
….when nesting list comprehensions, read from right to
left.

10. Function Definition :-
def name (arg1, arg2…. , argn)
“““ Documentation ””” #optional
statements
.
.
.
return expression
name(arg1,arg2) # Call to <name>

11. File Modes
• Mode Meaning
• 'r' open for reading (default)
• 'w' open for writing, truncating the file first
• 'a' open for writing, appending to the end of the file if it
exists
• 'b' binary mode

12. f = open(filename, [mode])
• read(), readline(), readlines()
• write(), writelines()
• seek(pos), tell()
• close()

13. • Classes
o Class Definition
o Class Objects
o Class Data members
o Class Methods
o Class Inheritance

14. class Stack:
"A well-known data structure…"
def __init__(self): # constructor
self.items = []
def push(self, x):
self.items.append(x) #. Push into the Stack…the sky is the limit
def pop(self):
x = self.items[-1] # Pop from the stack
del self.items[-1]
return x
def empty(self):
return len(self.items) == 0 # Boolean result

15. object = Stack() #--- Object of the Class “Stack”
….. Constructor invoked during Object instantiation
object.push(arg1) #---- Call to Class Method “push”
print object.items #---- Access the Class Data Member

16. • class BaseClass:
baseDataVar = 10
def baseMethods(self)
statements
class DerivedClass(BaseClass):
def Method()
print self.baseDataVar
self.baseMethods() #-- Call to base class method