Class 03 – Monday January 24

Naming Names: Beginning Variable Assignment

Some Haikus

Together we learn — To say what we mean to say — Most valuable skill

What makes me happy — Students asking their questions — So please keep it up.

Look both ways

Back or ahead

Quote of the day

So early in my life, I had learned that if you want something, you better make some noise. — Malcom X

First Example of the Day

Program camouflage_not_needed.py

What is happening today

Continue our exploration of digital problem solving

We will do this every class this semester

Expand our communication and abstraction skills

Readability and consistency

Ideas and plans are only good if they can be easily understood.

Must appreciate and strive for writing readable code

Practice debugging

Pay mindful attention to what our solutions actually say to do.

Recognize naming allows us to interact with the world around us.

Ability to name values is part of the essence of being human.

Ability to name values is a cornerstone of programming. Variables will be the means to do so.

Introduce how Python supports integer, decimal, and string values, and their manipulation.

Introduce additional terminology to which you should become accustomed

Typical during class activities

Learn

Try

Ask questions

Make suggestions

Provide answers

Typical post-class activities

Read

Examine class examples

Learn

Try

Write down questions

Complete the homework

Homework 03 Now Due Tuesday

Complete the homework

Make sure to follow all the instructions very carefully.

Vocabulary to which you should become accustomed

A lexicon when participating in computing-related structured communication

Algorithm

Program

Statement

Code

Execute (run)

Grammar

Syntax

Semantics

Style

snake_case

Comment

Header comment

Blank space

Indentation

Translate

Compiling

Interpret

Scripting

Identifier

Letter case

Expressions

Function

Built-in function

print()

Invoke

Argument

String

Literal

Parentheses

Single quote

Double quote

Upcoming example - Debugging

Program piaget.py

Typos galore

Code listing

Purpose: correct errant code
Author: Elizabeth Orrico
Id: emo7bf

print( "We learn best, when we must invent. -- Jean Piaget'
print( 'Necessity breeds invention.")

Program xy.py

Introduces naming and assignment operator

ducks

Program xyx.py

Introduces updated assignment

Python arithmetic

The Python arithmetic operators are: addition: +; subtraction: -; multiplication: *; decimal division: /; integer division: //; exponentiation: **; remaindering: %

If one of the operands of an arithmetic operation is decimal, the result is decimal; otherwise, the result is integer except for decimal division.

Identifiers and Keywords

An identifier is a sequence of characters such that the first character is alphabetic and the remaining characters (if any) are alphabetic or numeric

Python considers the underscore character (_) as alphabetic.

Keywords are words reserved by Python for special usage; as such, they cannot be used to name things.

For example, keyword import tells Python the contents of module (library) is to be included as a program resource.

To do list

Review class artifacts

Complete the homework due by Midnight Tuesday.

🦆 © 2022 Jim Cohoon

Resources from previous semesters are available.