PYTHON
Introduction
Points……..
• Python is recommended as the first programming
language for beginners.
• Python was developed by Guido Van Rossam in
1989 at NRI at Netherlands.
• Python was named based on T.V. show “The
Complete Monty Python’s Circus” of BBC channel
between 1969 – 1974
• Officially Python was released on Feb-20-1991.
• Python is General Purpose Language and HLPL.
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Python Development
• Python developed based on…..
A)basic coding from C-Language.
B)Object Oriented Programming features from
C++.
C)Scripting Language features from Perl and
Shell Scripting.
D)Most of syntax in python derived from C and
ABC-Language
Areas we use Python
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Development of WWW(web Applications).
Development of Desktop Softwares.
Development of RDBMS .
Development of Gaming Applications
Develoment of Networking Applications
Development of Data Analysis Applications
Development of Machine Learning.
Development of AI……
Sites developed using Python
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Google
Youtube
Yahoo
NASA
Dropbox
Reddit(Pure Python).
Features of Python
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Simple
Open Source
HLPL
Platform Independent
Portable
Dynamically Typed
Procedure and OOPS
Interpreted
Easy to Integrated
More Libraries.
Simple
• Python was designed to be easy for the
beginners to learn and use it effectively.
• The syntax is as simple as basic mathematic
operations and readability.
• Compare to other languages python is having
very less keywords .
High Level Language
• Python is a friendly language bcz it is HLPL.
• Python developer no need to think about
memory management .
Platform Independent
• Write once execute anywhere make’s Python
platform independent .
• PVM will take responsible to convert into
Machine understandable code.
Portable
• It is portable programming language.
• Python can be migrated easily from one
platform to another platform easily.
• “SAME RESULT ON ANY PLATFORM”.
Dynamically Typed
• Declaration of Datatype is not required for the
variables.
• Eg:- int a=10; in other languages
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a=10; in Python.
• Based upon the value Datatype is assigned.
PO and OO
• Python is both Procedure and Object Oriented
Programming Language.
Interpreted
• No need of compilation ,internally Python
Interpreter will take responsibility of
compilation.
• In case compilation fails Interpreter displays
syntax errors.
• PVM is responsible to execute Object
file(Compiled File).
Integration & Embedded
• Python supports integrating of other languages
into Python.
• Python+Java(existing code).
• Java+Python(Embedded).
• CPython:-used to work with C-Language
• Jython or Jpython:-for Java Applications(JVM)
• IronPython:-for C#.Net platform
Python Tokens
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Identifiers
Keywords
Datatypes
Literals
Comments
Identifiers
• A name in a program is called as identifier it can
be variable name,function name,class name
,module name etc..
• Rules…
A)can be a combination of letter and digits(a-z &
A-Z)
B)digits (0-9).
C)Special character (_). _ indicates it is private
D)it sholud not begin with digit.
E)it is case sensity language.
Keywords
• Keywords are also known as “Reserved words”
whose meaning already defiend to the
System.
• We have 30+ keywords.
eg:-while ,if , for, break,return ,import etc..
• All keywords in small case only except
True , False and None.
Data Types
• Represents the type of value we are going to
store in a variable.
• But in Python no need to specify the type ,
• Based upon the value the type is assigned.
• Python have the following datatypes(built-in).
• 1)int 2)float 3)complex 4)bool 5)str 6)bytes
7)bytearray 8)range 9)list 10)tuple 11)set
12)dict 13)None 14)frozenset
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Numeric
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1)int
2)float
3)bool
4)complex
Sequence
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List
Tuple
Set
String
Range
List
1)List is collection of entities.
2)Represented as[]
eg:lis=[100,101,108,1947,90,90]
Set
• 1)Set is sequence of elements
• 2)represented as {,}
• eg:ss={12.12,12.14,12,15}
Tuple
• Seuquence of elements….
• Represented as tu=(1,2,3,4,)
String
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1)String is sequence of characters….
2)used to represent labels
3)it is represented as “ ‘.
4)char is also represented as String in python.
Range
• Is used for iteration of elements(numbers….)
• Range(1)
• List(range(10) same for others…
Dictionary
• Which stores the elements in the form of
key and value pair.
represented as {k,v}