1. Learning Python 5th Edition
Python Tutorial
Learning Python 5th Edition

2. Why Python
Python is a general-purpose programming language that is often applied in scripting roles. It is commonly defined as an object- oriented scripting language
Why we use python
Software quality
Developer productivity
Program portability
Support libraries
Component integration
Enjoyment

3. Who Uses Python Today?
Google, YouTube ,Dropbox storage service, The Raspberry Pisingle-board computer,
EVE Online, a massively multiplayer online game (MMOG) by CCP Games,
The widespread Bit Torrent peer-to-peer file sharing system,
Industrial Light & Magic, Pixar, and others use Python in the production of animated movies.
ESRI uses as customization tool for its popular GIS mapping products.
Google’s App Engine web development framework
The Iron Port server product
Maya, a powerful integrated 3D modeling and animation system,
The NSA uses Python for cryptography and intelligence analysis.
iRobot uses Python to develop commercial and military robotic devices

4. What can I do with python
Systems Programming
GUIs
Internet Scripting
Component Integration
Database Programming
Rapid Prototyping
Numeric and Scientific Programming
And More: Gaming, Images, Data Mining, Robots, Excel...

5. How Python Runs Programs?
Python Interpreter
An interactive version of python that works in interpreted way
Hello to interpreter
Make a file with name script0.py
Write this code and save it
Run Program as

6. How you run programs Interactive way Entering multiline statements
Starting the python
Or use GUI based environment
Entering multiline statements

7. First Script
Make a file in text editor (i.e. notepad) with name script1.py
Run it like below
route the printed output of a Python script to a file to save it for later use

8. Module import and reloads
every file of Python source code whose name ends in a .py extension is a module
You can import the file within python environment as
To use script again and again in running session
Use reload method
A module is mostly just a package of
variable names (known as a Namespace)
the names within that package are called attributes.
An attribute is simply a variable name that is attached to a specific object (like a module)

9. Module Properties Make a variable in a file called myfile.py
Make a file threenames.py
title = "The Meaning of Life"

10. Modules and namespaces
are the largest program structure in Python programs, and one of the first key concepts in the language
Name Space
Python programs are composed of multiple module files linked together by import statements, and each module file is a package of variables
each module is a self-contained namespace
there are more ways to run code stored in module files

11. Variable Name Rules
Syntax: (underscore or letter) + (any number of letters, digits, or underscores)
Case matters: SPAM is not the same as spam
Reserved words are off-limits
Naming conventions
Names that begin with a single underscore (_X) are not imported by a from module import * statement
Names that have two leading and trailing underscores (__X__) are system-defined names that have special meaning to the interpreter
Names that begin with two underscores and do not end with two more (__X) are localized (“mangled”) to enclosing classes
The name that is just a single underscore (_) retains the result of the last expression when you are working interactively

12. Types and Operations The Python Conceptual Hierarchy
Programs are composed of modules.
Modules contain statements.
Statements contain expressions.
Expressions create and process objects.

13. Classes

14. Python Expressions

15. Variables and Basic Expressions
Variables are created when they are first assigned values.
Variables are replaced with their values when used in expressions.
Variables must be assigned before they can be used in expressions.
Variables refer to objects and are never declared ahead of time.
comment

16. Dynamic Typing
Variables, Objects, and References

17. Reference Checking

18. String
Python strings are categorized as immutable sequences

19. String Implicit concatenation: title = "Meaning " 'of' " Life“
Repetition:
Triple Quotes Code Multiline Block Strings

20. String Indexing and Slicing
will fetch every other item in X from offsets 1–9
Character code conversions

21. Changing Strings Strings are immutable Method Call Syntax
Attribute fetches
An expression of the form object.attribute means “fetch
the value of attribute in object.
Call expressions
An expression of the form function(arguments)
means “invoke the code of function, passing zero or more
comma-separated argument objects to it, and return
function’s result value
Method call expression:
object.method(arguments)

22. String class methods

23. String Methods: Examples

24. String Method Examples: Parsing Text

25. Other Common String Methods in Action

26. String Formatting Expressions
Allows us to perform multiple type-specific substitutions on a string in a single step
String formatting expressions: '...%s...' % (values)
String formatting method calls: '...{ }...'.format(values)
Dictionary-Based Formatting Expressions

27. String Formatting Method Calls

28. Lists and Dictionaries
Ordered collections of arbitrary objects
Accessed by offset
Variable-length, heterogeneous, and arbitrarily nestable
Of the category “mutable sequence”
Arrays of object references

29. Lists

30. Dictionaries Accessed by key, not offset position
Unordered collections of arbitrary objects
Variable-length, heterogeneous, and arbitrarily nestable
Of the category “mutable mapping”
Tables of object references (hash tables)

32. Tuples, Files, and Everything Else
Ordered collections of arbitrary objects
Accessed by offset
Of the category “immutable sequence”
Fixed-length, heterogeneous, and arbitrarily nestable
Arrays of object references

33. Tuples in Action
Concatenation
Repetition
Indexing/Slicing

34. Files

35. Files in Action

36. Storing Python Objects in Files: Conversions

37. Statements and Syntax

38. Assignment Statements

39. Expression Statements

40. Decision Statements

41. Switch statement Block Delimiters: Indentation Rules
Statement Delimiters: Lines and Continuations
Statements may span multiple lines if you’re continuing an open syntactic pair
Statements may span multiple lines if they end in a backslash

42. Loops

43. Handling Errors with try Statements

44. Functions and Generators
def is executable code
def creates an object and assigns it to a name
lambda creates an object but returns it as a result
return sends a result object back to the caller
yield sends a result object back to the caller, but remembers where it left off
global declares module-level variables that are to be assigned
nonlocal declares enclosing function variables that are to be assigned
Arguments are passed by assignment (object reference)
Arguments are passed by position, unless you say otherwise
Arguments, return values, and variables are not declared
def Executes at Runtime

45. Functions: Examples
Definition
Arbitrary scope nesting
Calls

46. Arguments
Arguments are passed by automatically assigning objects to local variable names
Assigning to argument names inside a function does not affect the caller
Changing a mutable object argument in a function may impact the caller
Immutable arguments are effectively passed “by value.”
Mutable arguments are effectively passed “by pointer.”

47. Keyword and Default Examples

48. Arbitrary Arguments Examples
The last two matching extensions, * and ** (for keyword arguments only) , are designed to support functions that take any number of arguments.