Module 2

What do comments start with

What do comments start with

a #

Lines of code can be categorized into three categories. What are they?

Input, processing, and output

Input statements

used to get data and pass it onto the program for processing

Processing Statements

Implement logic that is used to process the input and turn it into useful information

Output statements

used to display information on the screen

Algorithm

list of well defined computer instructions that can be used to solve a problem

program/source code/ code

List of statements that implement an algorithm using a programming language like python

variables

hold data that we can reuse in our program by writing the same variable name

Assignment Operator

right of the = is executed first, and result is assigned to the variable on the left

print

built in function to output data on the console

Debugging

process of finding bugs in your programs and sorting them out

Syntax Errors

language mistakes done by a programmer while writing code

Logic Errors

Algorithm that is used in the program is wrong.

String vs. Numbers

Strings include quotations, numbers do not

Rules for naming variables

1. consist of upper, lower letters, underscore, and numbers only

2. can only start with a letter or an underscore

3. case sensitive

4. cannot be the same as python reserved keywords

Strings

composed of one or more characters. Indicated by enclosing a value in single, double, or triple quotes

Escape Character “\”

changes the meaning of the character, appearing immediately afterwards

What can numbers be

Integers or Floating Point Numbers

Ints vs Float

Ints are whole numbers without a decimal point, floars have a decimal point

type

name of the built in function and we need to provide a variable as argument to this function

Typecasting

convert a value from one datatype to another datatype

What happens if you typecast a float into an integer

number is rounded down

What does input always read user data as

a string.

Formatted Output

Modifies the output according to the given pattern.

Multiline Strings

Triple Quotes

every program should have a __, and every expression should have a ____

statement, variable/literal

What is //

Floor Division Operator

What does // do

rounds float down to nearest whole number

How can you tell if it is a logical expression

uses and/or

what does ** do

exponent

What does / print

float

What does % print

int

Overflow

when a value is too large to be stored in the memory allocated by the interpreter