Python tutorial for beginners - Tib academy

INTRODUCTION
TO
PYTHON
Session-1
** python

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Agenda
What is Python...?
Differences between program and scripting language
History of Python
Scope of Python
Why do people use Python?
Installing Python IDE Who
uses python today What
can I do with python A
Sample Code Python code
execution Running Python

What is Python...?
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 program and
scripting language
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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 perform certain task.
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Scripting
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
Invented in the Netherlands, early 90s by Guido van Rossum
Python was conceived in the late 1980s and its implementation
was started in December 1989
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
“Python is an experiment in how much
freedom program-mers need. Too much
freedom and nobody can read another's
code; too little and expressive-ness is
endangered.”
- Guido van Rossum

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

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

Why do people use Python...?
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.
□ Indentation
Indentation is one of the greatest future in Python.
□ It’s free (open source)
Downloading and 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,

□ It’s mixable
- Python can be linked to components written in other languages easily
- Linking to fast, compiled code is useful to computationally intensive
problems
- - Python/C integration is quite common
□ It’s easy to use
- No intermediate compile and link steps as in C/ C++
- Python programs are compiled automatically to an intermediate form
called bytecode, which the interpreter then reads
- This gives Python the development speed of an interpreter without the
performance loss inherent in purely interpreted languages
□ It’s easy to learn
- Structure and syntax are pretty intuitive and easy to grasp

Installing Python
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 python 2.7 in that
one you can select python
(command line) it is prompt
with »>

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Python 2.7 r* IDLE (Python
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Manuals j§l Uninstall Python
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Search programs and files
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Who uses python today...
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

What can I do with Python...?
System programming
Graphical User Interface Programming
Internet Scripting
Component Integration
Database Programming
Gaming, Images, XML , Robot and more

A Sample Code
x = 34 - 23 # A comment.
y = “Hello” # Another one.
z = 3.45
if z == 3.45 or y == “Hello”: x = x + 1
y = y + “ World” # String concat. print
x print y

Enough to understand the code
Indentation matters to code meaning
- Block structure indicated by indentation First assignment
to a variable creates it
- Variable types don’t need to be declared.
- Python figures out the variable types on its own.
Assignment is = and comparison is ==
For numbers + - * / % are as expected
- Special use of + for string concatenation and % for string
formatting (as in C’s printf)
Logical operators are words (and, or, not) not symbols
The basic printing command is print

Python Code Execution
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.
Source Bytecode Runtime
Source code extension is .py Byte code extension is
.pyc (compiled python code)

Running Python
Once you’re inside the Python interpreter, type in commands at will. •
Examples:
>>> print ’Hello world’
Hello world
# Relevant output is displayed on subsequent lines without the >>>
symbol
>>> x = [0,1,2]
# Quantities stored in memory are not displayed by default
>>> x
# If a quantity is stored in memory, typing its name will display it [0,1,2]
>>> 2+3 5

Python tutorial for beginners - Tib academy

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