Module 2 video notes

Question 1

Script

Answer 1

A sequence of instructions to tell computers what to do
- Made of one or more statements

Question 2

Statement

Answer 2

A syntactic unit of a programming language that expresses some action to be carried out
- Think ‘sentences’ or ‘paragraphs’ of writing artifact

Question 3

What are variables?

Answer 3

• It is a reference to a place in the computer’s memory where some values are stored (temporarily)
• Computers have extremely ‘short’ memory because memory is expensive
• Only store limited amount of data (1’s and 0’s)

Question 4

What do we do with variables?

Answer 4

Calculate some arithmetic operations: addition (+), subtraction (-), multiplication (*), division (/), etc

Question 5

What about letters, sounds, pictures?

Answer 5

1’s and 0’s can be transformed into other symbolic expressions

Question 6

What are diff data types?

Answer 6

Numbers
- Integers (1, 2, 3,….)
- Boolean: 1(True), 0(False)
- Float: numbers with decimals

Strings
- Texts - a sequence of values that represent Unicode code points (think of alphabet)

Question 7

What are operators?

Answer 7

Symbols that perform the following:
- Addition
- Subtraction
- Multiplication
- Division
- And more…

Question 8

How to work with text in Python. What do computers only recognize?

Answer 8

Computers only recognize 1’s and 0’s
Computers use alphabet – a set of letters that come in packages, usually in order sequences
We can assign numbers to each letter. Ex: A: 65, a: 97

Question 9

What are the common encoding or set of codes?

Answer 9

Unicode, ASCII

These were developed originally with typewriter in mind

Question 10

Elaborate

Special characters in Python have special meaning in Python

Answer 10

• Quotes – single, double, triple (Indicates a string)
• Hashtags (comment)
• Use escape character to escape its alternate use (' single quote and "” double quote)

Question 11

How do conditional statements - IF provide multiple pathways to decision?

Answer 11

IF – creates conditions

Question 12

What are conditions in IF statements?

Answer 12

Condition: compares something to be true or false
- If true, do something
- Else (if false), do something else

Question 13

Why descriptive statistics?

Answer 13

To Summarize Data
- Mean/Median/Mode (all of these names mean the same thing really)
- SD, Var, Range (Min, Max), (these all really mean the same thing too)
- Sum
- Count

Question 14

What are Python statements and scripts?

Answer 14

They are used to instruct computers to execute mathematical operations

Question 15

What are variables used for?

Answer 15

They store data into computer’s memory so that you can use/reuse it later

Question 16

What kind of data hels you organize information for different use cases?

Answer 16

Numbers
Strings (i.e. letters, texts)