Introduction to Python

Introduction to Python I (revised) CSE 391 Introduction to Artificial Intelligence Fall 2006

This Set of Notes ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Python

Why Python for CSE-391? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Technical Issues Installing & Running Python

The Python Interpreter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The IDLE GUI Environment (Windows)

IDLE Development Environment ,[object Object],[object Object],[object Object],[object Object]

Running Interactively on UNIX ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Running Programs on UNIX ,[object Object],[object Object],[object Object],[object Object]

A Code Sample ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Our Code Sample in IDLE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Enough to Understand the Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic Datatypes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Whitespace ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comments ,[object Object],[object Object],[object Object],[object Object],[object Object]

Assignment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Accessing Non-Existent Name ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multiple Assignment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Naming Rules ,[object Object],[object Object],[object Object],[object Object]

Understanding Reference Semantics in Python (Adapts several slides by Guido van Rossum)

Understanding Reference Semantics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Understanding Reference Semantics II ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Type: Integer Data: 3 Name: x Ref: <address1> name list memory

Understanding Reference Semantics III ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Understanding Reference Semantics IV ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Type: Integer Data: 3 Name: x Ref: <address1>

Understanding Reference Semantics IV ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Type: Integer Data: 3 Name: x Ref: <address1> Type: Integer Data: 4

Understanding Reference Semantics IV ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Name: x Ref: <address1> Type: Integer Data: 4

Assignment 1 ,[object Object],Type: Integer Data: 3 Name: x Ref: <address1>

Assignment 1 ,[object Object],Type: Integer Data: 3 Name: x Ref: <address1> Name: y Ref: <address1>

Assignment 1 ,[object Object],Type: Integer Data: 3 Name: x Ref: <address1> Type: Integer Data: 4 Name: y Ref: <address1>

Assignment 1 ,[object Object],Type: Integer Data: 3 Name: x Ref: <address1> Type: Integer Data: 4 Name: y Ref: <address2>

Assignment 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],immutable mutable

Why? Changing a Shared List a 1 2 3 b 4 a = [1, 2, 3] a.append(4) b = a a 1 2 3 b a 1 2 3

Our surprising example surprising no more... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sequence types: Tuples, Lists, and Strings

Sequence Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Similar Syntax ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sequence Types 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sequence Types 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Positive and negative indices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Slicing: Return Copy of a Subset 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Slicing: Return Copy of a Subset 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Copying the Whole Sequence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The ‘in’ Operator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The + Operator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The * Operator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Tuples: Immutable ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lists: Mutable ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operations on Lists Only 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The extend method vs the + operator. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operations on Lists Only 3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operations on Lists Only 4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Assignment & Mutability 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],immutable mutable

Tuples vs. Lists ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction to Python

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Introduction to Python