Classes in python

1. Presented by: Prithwish Chakraborty
LET’S CODE!!!
Sponsored by: AKAMAI
Reference: http://www.tutorialspoint.com/python/python_classes_objects.htm

2.  Python
 Variables:
 Basic data structures :
 Lists
 Dictionaries
 Tuples
 Basic operators:
 Addition/subtraction
 Division/Mutliplication
 Functions??
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4.  Problem:
 Build an employee database
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5.  Problem:
 Build an employee database
 What attributes do we want to keep?
 Employee Name: e.g. Sylvester Stallone
 Employee Address: e.g. (Beverly Hills, California, USA)
 Employee Id: e.g. 127001
 Employee Salary: e.g. $1000000
 What operations do we want?
 What other things can we do?
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6.  Problem:
 Build an employee database
 What attributes do we want to keep?
 What operations do we want?
 Get Employee Name
 Get Employee id
 Change Salary
 Give 100$ bonus if address is in Beverly Hills
 Add a new information about the employee
 Add info about speciality e.g. “Mind Blowing Action Movies”
 What else can we do?
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7.  Create an Employee:
 Which data structure to use ??
 Lets use dict
 Attributes:
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Attribute Type Example
name string “Sylvester Stallone”
address tuple (“Beverly Hills”,”CA”,”USA”)
id int 127001
salary int 1000000

8.  Create an Employee:
 Functions:
 Now let us extend this to a database >
 Non-object oriented way
 Object Oriented way
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Actions Example Logic
get_employee_name “Sylvester Stallone”
get_employee_id 127001
change_salary if(address[0] == “Beverly Hills”): salary += 100
Add_new_info Add attribute: Speciality

9.  Basic philosophy
 A “container” to hold attributes and operations realted
to those attributes in one single place!!
 Anybody having C background?? – lets start of by
thinking of struct: container to hold data
 How about if we have some funcitons?
 What you ask about the syntax?? ok so be it
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 Example of a class:
 Special notes : self

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 Example of a class:
 Special notes : self
 Looking a bit deepr: where are these created

12.  Some other concepts
 Adding attributes
 Deleting instances
 Control the delete operation
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13.  Problem:
 Build an employee database
 What attributes do we want to keep?
 What operations do we want?
 What else can we do?
 Extend definitons of Employee
 Multiple Inheritance
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14.  Creating a “super Employee”
 Use attributes the same as Employee but add a new
attribute: position
 Way out : Inheritance
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15.  Change the bonus function
 Give 100$ more if CEO
 Way out function overloading
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16.  Multiple Inheritance
 Another “base class”
 Creating the super Duper employee
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17.  Operator overloading
 Iterators
 Generators
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18. A Big thanks to the sponsor for this session:
 And best of all!! Akamai is currently recruiting for
summer interns. All positions are listed at
jobs.akamai.com or you can send resumes directly to
gkoenig@akamai.com
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19.  Sample Codes:
https://c9.io/pchakraborty/lets-code
 Other refereces:
http://docs.python.org/2/tutorial/classes.html
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