Python Programming Basics

Feb 2, 2016Download as pptx, pdf

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RichardAlexanderPhilip

Python programming basics, installation process, loops in python, if else (conditional loop), syntax, etc

 Kashmira Rao
 Pramod Rajan
 Amarjeet Sav

 Introduction
 History
 Features
 Installation
 Basic Datatypes
 Whitespace
 Control Statements

http://docs.python.org/

 Python is pre-installed on most Unix systems,
including Linux and MAC OS X
 The pre-installed version may not be the
most recent one (2.6.2 and 3.1.1 as of Sept
09)
 Download from http://python.org/download/
 Python provides two options
 IDLE
 Command Line Interpreter

 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 operator is = and comparison
operator is ==

 For numbers + , - , * , / , % are as
expected
◦ Special use of + for string concatenation
 Logical operators are words (and, or,
not) not symbols
 The basic printing command is print

 You can assign values to multiple variable at
the same time
>>> x, y = 2, 3
>>> x
2
>>> y
3
This makes it easy to swap values
>>> x, y = y, x
 Assignments can be chained
>>> a = b = x = 2

 The main statement used for selecting from
alternative actions based on test results
 It’s the primary selection tool in Python and
represents the Logic process

Simple If statement
 It takes the form of an if test
 if <test>:
<statement>

Simple If statement
 if 4>3:
print (“it is true that 4>3”)
 if a==1:
print (“true” )
 a=10
 if a==10:
print (“a=10”)

If Statement “login” example
password=‘coolguru ‘
If password== input(“Enter your password :”):
print(“You have logged in” )

If... else statement
 It takes the form of an if test, and
ends with an optional else block
 if <test>:
<statement1>
else:
<statement2>

If Statement “login” example
password=‘coolguru ‘
If password== input(“Enter your password :”):
print(“You have logged in” )
else:
print(“ invalid password “)

If… else if … else statement
 It takes the form of an if test, followed by
one or more optional elif tests, and ends
with an optional else block
if <test1>:
<statement1>
elif <test2>:
<statement2>
else:
<statement3>

If… else if … else statement
example
number = 23
guess = int(input('Enter an integer : '))
if guess == number:
print ( 'Congratulations, you guessed it.‘)
print ("(but you do not win any prizes!)“)
elif guess < number:
print ('No, it is a little higher than that' )
else:
print ('No, it is a little lower than that‘)

 Console applications
 Enterprise applications
 Web applications
 Mobile applications
 Office applications

 Used for Scripting.
 Developing games.
 Graphics and Animation
 Google search engine & Youtube
 Yahoo maps
 Financial applications

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Python Programming Basics

1.  Kashmira Rao  Pramod Rajan  Amarjeet Sav

2.  Introduction  History  Features  Installation  Basic Datatypes  Whitespace  Control Statements

3. http://docs.python.org/

4.  Python is pre-installed on most Unix systems, including Linux and MAC OS X  The pre-installed version may not be the most recent one (2.6.2 and 3.1.1 as of Sept 09)  Download from http://python.org/download/  Python provides two options  IDLE  Command Line Interpreter

12.  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 operator is = and comparison operator is ==

13.  For numbers + , - , * , / , % are as expected ◦ Special use of + for string concatenation  Logical operators are words (and, or, not) not symbols  The basic printing command is print

14.  You can assign values to multiple variable at the same time >>> x, y = 2, 3 >>> x 2 >>> y 3 This makes it easy to swap values >>> x, y = y, x  Assignments can be chained >>> a = b = x = 2

15.  The main statement used for selecting from alternative actions based on test results  It’s the primary selection tool in Python and represents the Logic process

16. Simple If statement  It takes the form of an if test  if <test>: <statement>

17. Simple If statement  if 4>3: print (“it is true that 4>3”)  if a==1: print (“true” )  a=10  if a==10: print (“a=10”)

18. If Statement “login” example password=‘coolguru ‘ If password== input(“Enter your password :”): print(“You have logged in” )

19. If... else statement  It takes the form of an if test, and ends with an optional else block  if <test>: <statement1> else: <statement2>

20. If Statement “login” example password=‘coolguru ‘ If password== input(“Enter your password :”): print(“You have logged in” ) else: print(“ invalid password “)

21. If… else if … else statement  It takes the form of an if test, followed by one or more optional elif tests, and ends with an optional else block if <test1>: <statement1> elif <test2>: <statement2> else: <statement3>

22. If… else if … else statement example number = 23 guess = int(input('Enter an integer : ')) if guess == number: print ( 'Congratulations, you guessed it.‘) print ("(but you do not win any prizes!)“) elif guess < number: print ('No, it is a little higher than that' ) else: print ('No, it is a little lower than that‘)

23.  Console applications  Enterprise applications  Web applications  Mobile applications  Office applications

24.  Used for Scripting.  Developing games.  Graphics and Animation  Google search engine & Youtube  Yahoo maps  Financial applications

Python Programming Basics

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