11 Unit1 Chapter 1 Getting Started With Python

CHAPTER 1
GETTING STARTED WITH PYTHON

4.1 Unit 1:
Programming and Computational Thinking (PCT-1)
XI
Computer Science (083)
Board : CBSE
Courtesy CBSE

4.1 Unit I
Programming and Computational
Thinking (PCT-1)
(80 Theory + 70 Practical)
DCSc & Engg, PGDCA,ADCA,MCA.MSc(IT),Mtech(IT),MPhil (Comp. Sci)
Department of Computer Science, Sainik School Amaravathinagar
Cell No: 9431453730
Praveen M Jigajinni
Prepared by
Courtesy CBSE

INTRODUCTION
Python is a high-level, interpreted and general-
purpose dynamic programming language that
focuses on code readability. The syntax in Python
helps the programmers to do coding in fewer steps
as compared to Java or C++.
The language founded in the year 1991 by the
developer Guido Van Rossum has the programming
easy and fun to do.

GUIDO VAN ROSSUM
Guido van Rossum is a
Dutch programmer best
known as the author of
the Python programming
language, for which he
was the "Benevolent
Dictator For Life" until he
stepped down from the
position in July 2018.

GUIDO VAN ROSSUM
Born 31 January 1956 (age 62)
Haarlem, Netherlands
Residence Belmont, California, U.S.
Nationality Dutch
Alma mater University of Amsterdam
Occupation Computer programmer,
author
Employer Dropbox
Known for Creating the Python
programming language
Spouse(s) Kim Knapp (m. 2000)
Children Orlijn Michiel Knapp-van
Rossum
Website www.python.org/~guido/

INTRODUCTION
The Python is widely used in bigger
organizations because of its multiple
programming paradigms. They usually
involve imperative and object-oriented
functional programming. It has a
comprehensive and large standard
library that has automatic memory
management and dynamic features.

INTRODUCTION
Python is a general-purpose language,
which means it can be used to build just about
anything, which will be made easy with the
right tools/libraries.
Professionally, Python is great for backend
web development, data analysis, artificial
intelligence, and scientific computing. Many
developers have also used Python to build
productivity tools, games, and desktop apps, so
there are plenty of resources to help you learn
how to do those as well.

HISTORY OF PYTHON
Work on Python began in late
1989 by Guido van Rossum, then at
Centrum Wiskunde (Pronounce as viskulu
meaning mathematics) & Informatica CWI
in the Netherlands, and eventually
released for public distribution in early
1991.

HISTORY OF PYTHON
Python was conceived in the late
1980s, and its implementation began in
December 1989 by Guido van Rossum at
meaning mathematics) & Informatica
(CWI) in the Netherlands as a successor to
the ABC language (itself inspired by SETL)
capable of exception handling and
interfacing with the Amoeba operating
system.
Where was Python created?

HISTORY OF PYTHON
Since most modern OS are written in
C, compilers/interpreters for modern
high-level languages are also written in C.
Python is not an exception - its most
popular/"traditional" implementation is
called CPython and is written in C. There
are other implementations: IronPython
(Python running on .NET).
What language is Python written in?

HISTORY OF PYTHON
How did it all begin? Innovative
Languages are usually born from one of two
motivations:
(1) A large well-funded research project
or
(2) General frustration due to the lack of tools
that were needed at the time to accomplish
mundane and/or time-consuming tasks, many
of which could be automated.

HISTORY OF PYTHON
 How did it all begin? Innovative
At the time, van Rossum was a researcher with
considerable language design experience with
the interpreted language ABC, also developed
at CWI (Centrum Wiskunde (Pronounce as
viskulu meaning mathematics) &
Informatica.P.O.Box 940791090 GB Amsterdam
NETHERLANDS), but he was unsatisfied with its
ability to be developed into something more.

HISTORY OF PYTHON
 How did it all begin? Innovative
Some of the tools he envisioned were for
performing general system administration tasks,
so he also wanted access to the power of
system calls that were available through the
Amoeba distributed operating system. Although
an Amoeba-specific language was given some
thought, a generalized language made more
sense, and late in 1989, the seeds of Python
were sown.

HISTORY OF PYTHON
 What is CWI? Where it is located?
meaning mathematics) & Informatica (CWI) is
the national research institute for mathematics
and computer science in the Netherlands.
Founded in 1946, CWI is part of the Institutes
Organisation of NWO, NWO-I. While located
at Amsterdam Science Park, this institute has
strong international links, and enjoy a global
reputation for innovative research.

HISTORY OF PYTHON - NETHERLANDS

HISTORY OF PYTHON – CWI GOOGLE MAP

Where does the Python
name come from?

When he began
implementing Python, Guido van
Rossum was also reading the published
scripts from “Monty Python's Flying
Circus”, a BBC comedy series from the
1970s. Van Rossum thought he needed
a name that was short, unique, and
slightly mysterious, so he decided to call
the language Python.
Where does the Python name come from?

Python has top the charts in the recent years
over other programming languages like C, C++
and Java and is widely used by the programmers.
The language has undergone a drastic change
since its release 25 years ago as many add-on
features are introduced. The Python 1.0 had the
module system of Modula-3 and interacted with
Amoeba Operating System with varied
functioning tools. Python 2.0 introduced in the
year 2000 had features of garbage collector and
Unicode Support.
WHY COMPANIES PREFER PYTHON?

Python 3.0 introduced in the year 2008 had a
constructive design that avoids duplicate
modules and constructs. With the added
features, now the companies are using Python
3.5.
The software development companies prefer
Python language because of its versatile features
and fewer programming codes. Nearly 14% of
the programmers use it on the operating systems
like UNIX, Linux, Windows and Mac OS.

The programmers of big companies use Python
as it has created a mark for itself in the software
development with characteristic features like:
Interactive
Interpreted
Modular
Dynamic
Object-oriented
Portable
High level
Extensible in C++ & C

The programmers of big companies use Python
as it has created a mark for itself in the software
development with characteristic features like:
Easy-to-learn
Easy-to-read
Easy-to-maintain
Robust
Effective as a Rapid Prototyping Tool
A Memory Manager
Interpreted and (Byte-) Compiled

PYTHON ADVANTAGES - PLUS POINTS

01. Easy to Use.
02. Expressive Language.
03. Interpreted Language.
04. Its Completeness.
05. Cross Plat Form Language.
06. Free and Open Source.
07. Variety of Usage/Applications.

08. Interactive.
09. Modular.
10. Dynamic.
11. Object-oriented.
12. Portable.
13. High level.
14. Extensible in C++ & C.

15. Easy-to-learn .
16. Easy-to-read.
17. Easy-to-maintain.
18. Robust.
19. Effective as a Rapid Prototyping Tool
20. A Memory Manager.
21. Interpreted and (Byte-) Compiled.
22. Multi paradigm language.

23. Acts as foundation to learn other
languages.
24. Perfect to build prototypes.
25. Flexible.
26. Case Sensitive Language.
27. Structured programming language.
30. Scientific Language.
31. General purpose language.

PYTHON DISADVANTAGES - MINUS POINTS
01. Speed.
02. Mobile Development.
03. Easy-to-maintain.
04. Memory Consumption.
05. Database Access.
06. Runtime Errors.
07. Not Strong on Type-Binding or
Dynamic Typing.

PYTHON DISADVANTAGES - MINUS POINTS
08. Python is evolving continuously.
09. Not a great choice for a high-graphic
3d game.
10. Designs issues.
11. Memory Consumption.
12. Simple rules.

COMPILER
Its a translator used to convert HLL to MLL
and vice versa.

INTERPRETER
Its a translator used to convert HLL to MLL
and vice versa.

WORKING IN PYTHON
Python is free, open-source software
that works on Linux, Mac, Windows, and
various other platforms (21 in total).
It comes preinstalled on Mac and most
distributions of Linux.
There are multiple python
distributions available.

PYTHON DISTRIBUTION
A Python distribution is a software
bundle, which contains a Python
interpreter and the Python standard
library. Installer programs for common
operating systems.
What is Python distribution?

PYTHON DISTRIBUTION
• Aside from the official CPython
distribution available from python.org,
other distributions based on CPython
include the followings:

SOME OF PYTHON DISTRIBUTION
ENTHOUGHT'S CANOPY

SOME OF PYTHON DISTRIBUTION
WINPYTHON

SOME PYTHON DISTRIBUTION
CHINESEPYTHON PROJECT: Translation of
Python's keywords, internal types and
classes into Chinese. Eventually allows a
programmer to write Python programs in
Chinese.

Integrated
Development
Environment
(IDE)

What is an IDE?
An integrated development environment
(IDE) is a software application that provides
comprehensive facilities to computer
programmers for software development.
An IDE normally consists of a source code
editor, build automation tools, and a debugger.
Most modern IDEs have intelligent code
completion.

PYTHON IDE / IDLE
IDLE (short for integrated
development environment or integrated
development and learning environment)
is an integrated development
environment for Python, which has been
bundled with the default implementation
of the language since 1.5.2b1.
... Pythonshell with syntax highlighting.
What is Python IDE or IDLE?

POPULAR PYTHON IDEs
GitHub : NINJA IDE

POPULAR PYTHON IDEs
PYSCRIPTER

POPULAR PYTHON IDEs
CODERS’ DIARIES

WORKING WITH
DEFAULT
CPYTHON DISTRIBUTION

PYTHON
INTRACTIVE
MODE
PYTHON
IDLE

PYTHON SHELL
What is Shell?
A shell is usually an "interactive shell",
usually termed a REPL which stands for
"Read - Execute - Print - Loop" Most
interpreted languages offer a REPL
interface - whether its LISP, python, BASIC
or Javascript or even DOS batch language
or Unix Shells. The interpreter is what
actually executes the lines of code.

PYTHON SHELL
What is Python Shell or Python
Interactive Shell?
The Python interpreter can be used from
an interactive shell. The interactive shell
is also interactive in the way that it stands
between the commands or actions and
their execution. ... Python offers a
comfortable command line interface with
the Python shell, which is also known as
the "Python interactive shell".

PYTHON BASIC MODES
What are the basic modes of python?
Python has two basic modes:
1) Script and
2) Interactive.

PYTHON BASIC MODES
1) Script Mode:
The normal mode is
the mode where the scripted and
finished .py files are run in
the Python interpreter.

PYTHON BASIC MODES
2) Interactive Mode:
Interactive mode is a command line
shell which gives immediate feedback
for each statement, while running
previously fed statements in active
memory.

SCRIPT
What is Script?
Scripts are reusable. Basically,
a script is a text file containing the
statements that comprise
a Python program. Once you have
created the script, you can execute it
over and over without having to
retype it each time. Scripts are
editable.

Saving Script / Program File
Click On File
Select Save
Give filename with
py extension
For Example:
first.py
Or
first.PY

Running or Executing Program / Script
Click On Run
Select
Run Module
Or
F5

JUPYTER NOTEBOOK IDE
The Jupyter Notebook is an ANACONDA TOOL
and is an open-source web application that
allows you to create and share documents that
contain live code, equations, visualizations and
narrative text.
Note: Jupyter Notebook runs on your browser.
What is Jupyter Notebook?

SPYDER IDE
Spyder is an open source cross-
platform integrated development
environment (IDE) for scientific
programming in the Python language
What is Spyder?

PyScripter IDE
PyScripter is a free and open-source
Python Integrated Development
Environment (IDE) created with the
ambition to become competitive in
functionality with commercial Windows-
based IDEs available for other languages
What is PyScripter?

11 Unit1 Chapter 1 Getting Started With Python

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