Python programming notes all in one python ppt

What We Giveyou?
2
• What is Python...?
• Differences between program and scripting language
• History of Python
• Scope of Python
• What can I do with python
• Who uses python today
• Why do people use Python?
• Installing Python IDE
• A Sample Code
• Python code execution
• Running Python
• Python Basic(Variable, Strings, Data types etc.)

What is Python ...?
3
• Python is a general purpose programming language that
is often applied in scripting roles.
• So, Python is programming language as
well as scripting language.
• Python is also called as Interpreted language

Differences between pr ogram and
scripting language
4
Program
•a program is executed
(i.e. • the
source is first
compiled, • and the
result
of that
compilation is expected)
•A "program" in general,
is a
sequence of
instructions written so
that a computer can
Scripti ng
a script is interpreted
A "script" is code written in a
scripting language. A scripting
language is nothing but a type
of programming language in
which we can write code to
control
another software application.

History
Netherlands, early
5
• Invented in
the Rossum
90s by Guido van
• Python was conceived in the late
1980s implementation was started in
December 1989
and its
• Guido Van Rossum is fan of 'Monty Python's
Flying Circus', this is a famous TV show in Netherlands
• Named after Monty Python
• Open sourced from the beginning

Python S Benevolent Dictator For Life
6
"Python is an experiment in
much freedom programmers
how
need.
Too much freedom and nobody can
read another's code; too little and
expressiveness is endangered.''
- Guido van Rossum

Why was python
created ?
7
"My original motivation for creating Python was
the in
the
perceivedneed for a higher level
Amoeba [Operating Systems] project.
language
Moreover, doing these things in the
wouldn't work for a va riety of reasons. ...
So, there was a need for a
Bourne shell
la
nguage
that
would bridge the gap between C and the shell"
- Guido Va n Rossum
I realized
that
the
development of system
administration utilities in C was taking too long.

Scope of Python
8
• Science
- Bioinformatics
• System Administration
-Unix
-Web logic
-Web sphere
• Web Application Development
-CGI
-Jython - Servlets
• Testing scripts

What can I do with Python ...?
9
• Systetn progratntning
• Graphical User Interface Progratntning
• Internet Scripting
• Cotnponent Integration
• Database Progratntning
• Gatning, Itnages, XML , Robot and tnore

Who usespython today ...
10
• Python
is
being applied in real revenue-generating products
by real companies. For instance:
•Google makes extensive use of Python in
its web search system, and employs Python's
creator.
•Intel, Cisco, Hewlett-Packard, Seagate, Qualcomm,
and IBM use Python for hardware testing.
•ESRI uses Python as an end-user
customization tool for its popular GIS mapping
products.
•The YouTube video sharing service is
largely written in Python

Why dopeople use Python ...?
11
The following primary factors cited by Python users
seem to be these:
•Python is object-oriented
Structure supports such concepts as polymorphism,
operation overloading, and multiple inheritance.
•It's free (open source)
Downloadingand installing Python is free and easy
Source code is easily accessible

• It's powerful
- Dynamic typing
- Built-in types and tools
- Library utilities
- Third party utilities (e.g. Numeric, NumPy, SciPy)
- Automatic memory management
• It's portable
- Python runs virtually every major platform used today
- As long as you have a compatible Python interpreter
installed, Python programs will run in exactly the
same manner, irrespective of platform.
12

Insta lling Python
13
• Python is pre-installed on most Unix systems,including Linux and
MAC OS X
• But for in Windows Operating Systems , user can download
from the
https ://www.python.org/downloads/
- from the above link download latest version of python IDE
and install, recent version is 3.4.1 but most of them uses
version 2.7.7 only

• After installing the
Python Ver#2.7.7, go to
start menu then click on
14
python 2.7 in that one
you can select
.
(command line) it IS
prompt with >>>
python
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Running Python
16
Once you're inside the Python interpreter, type in commands at will.
•Examples:
>>> print 'Hello world' Hello world

Python Code Execution
17
• Python's traditional runtime execution model: source code
you type is translated to byte code, which is then run by the
Python Virtual Machine. Your code is automatically
compiled, but then it is interpreted.
Sour
ce
Byte
code
Runtim
e
.....-..
PVM
,--
-
... ..
. ....
,,
I I

t
.....-..
'
·
I '
'

I'
I
I
#
.
.
,
.
.
,
---
---
...
m.py
Source code extension is .py
Byte code extension is .pyc (compiled python code)

MATH(OPERATOR) IN PYTHON
.
. .
. .
.

Math
19
Try typing this into Code:
>>> print 3 + 12
15
>>> print 12 - 3
9
>>> print 9 + 5 - 15 + 12
11
Operators: add: + subtract: -
Note: don't type the arrows >>> !

Math
Rule: If you want Python to answer in floats, you have to talk
to it in floats.
20
More operators:
divide: I
multiply: *
>>> print 3 * 12 36
>>> print 12 I 3 4
>>> print 11 I 3 3
>>> print 12.0 I 3.0 4.0
>>> print 11.0 I 3.0 3.66

Math
21
Practice:
>>> print False < True True
>>> print 2 < 3 True
>>> print 2 <= 2 False
>>> print 3 > 2 True
>>> print 2
.'
=
3 True

Strings
23
Examples:
Try typing one without quotes:
What's the result?
>>> "It's a beautiful
day!"
>>> "Goodbye, cruel
world.
"
>>> Aggies
>>> "Aggies "
>>> "Rice fight, never
die!"
>>> "3 + 2''

Strings
24
String operators:
concatenation: +
multiplication: *
Try concatenating:
Try multiplying:
>>> print "Hello "
+
" " +
>>>
250
"world!
"
print "HAHA" *

- - -
-
25
VARIABLES IN PYTHON

Variable
26
Create a Variable:
>>>headmaster="Dumbledore"
>>>print headmaster
'Dumbledore'
Assigning a New Value:
>>>headma ster="Hardcastle"
>>>print headmaster 'Hardcastle'

Data Type:
28
Python has many native data types. Here are the important ones:
Booleans are either True or False.
Numbers can be integers (1 and 2L floats (1.1and 1.2), fractions
(1/2 and 2/3), or even complex numbers.
Strings are sequences of Unicode characters, e.g. an HTML document.
Bytes and byte arrays,e.g. a JPEG image file. Lists are ordered
sequences of values.
Tuples are ordered,immutable sequences of va lues. Sets are
unordered bags of values.

Example:
29
String
Integer
Float
List
''Wh oop !''
42
3.14159
["John",
"Paul","George","Ringo"]
Python can tell us about types using the type()
function:
>>> print type("Whoop! ")
<type 'str'>

List:
31
The list is a most versatile Data type ava ilable in Python which
can be written as a list of comma-sepa rated values (items)
between square brackets. Important thing about a list is that
items in a list need not be of the same type.
Example:
listl = ['physics', 'chemistry', 1997,2000];
list2 = [1, 2,3,4,5 ];

Python programming notes all in one python ppt

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Python programming notes all in one python ppt