Introduction to Python - Part Three

Introduction to Python III CSE 391: Artificial Intelligence adapted from slides by Matt Huenerfauth for CSE 391, 1/05

Importing and Modules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

import … ,[object Object],[object Object],[object Object],[object Object],[object Object]

from … import * ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

from … import … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Commonly Used Modules ,[object Object],[object Object],[object Object],[object Object],[object Object]

More Commonly Used Modules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Defining your own modules ,[object Object],[object Object],[object Object]

Directories for module files ,[object Object],[object Object],[object Object],[object Object],[object Object]

Object Oriented Programming in Python: Defining Classes

It’s all objects… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Defining a Class ,[object Object],[object Object],[object Object],[object Object]

Methods in Classes ,[object Object],[object Object],[object Object],[object Object]

A simple class definition: student ,[object Object]

Creating and Deleting Instances

Instantiating Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Constructor: __init__ ,[object Object],[object Object],[object Object]

Self ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deleting instances: No Need to “free” ,[object Object],[object Object],[object Object],[object Object],[object Object]

Access to Attributes and Methods

Definition of student ,[object Object]

Traditional Syntax for Access ,[object Object],[object Object],[object Object],[object Object],[object Object]

Accessing unknown members ,[object Object],[object Object],[object Object],[object Object]

getattr(object_instance, string) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

hasattr(object_instance,string) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Two Kinds of Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Class Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],class sample : >>> a = sample() x = 23 >>> a.increment() def increment (self): >>> a.__class__.x self.__class__.x += 1 24

Data vs. Class Attributes ,[object Object],>>> a = counter() >>> b = counter() >>> a.increment() >>> b.increment() >>> b.increment() >>> a.my_total 1 >>> a.__class__.overall_total 3 >>> b.my_total 2 >>> b.__class__.overall_total 3

Subclasses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Redefining Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Definition of a class extending student ,[object Object],[object Object],[object Object],[object Object],[object Object]

Extending __init__ ,[object Object],[object Object],[object Object],[object Object]

Special Built-In Methods and Attributes

Built-In Members of Classes ,[object Object],[object Object],[object Object],[object Object]

Special Methods ,[object Object],[object Object],[object Object],[object Object]

Special Methods – Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Special Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Special Data Items ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Special Data Items – Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Private Data and Methods ,[object Object],[object Object],[object Object]

File Processing and Error Handling: Learning on your own…

File Processing with Python ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exception Handling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

My favorite statement in Python ,[object Object],[object Object],[object Object],[object Object],[object Object]

Regular Expressions and Match Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Finally… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction to Python - Part Three

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Introduction to Python - Part Three