Python Intro/Syntax

Question 1

Basic Python Syntax rule:

Answer 1

Capitalization matters

Each statement on one line, by itself

Indentation matters!!!

Quotes around strings like “red”, no quotes around numbers

Question 2

understanding errors:

Answer 2

Tip: read Python’s helpful error message and check for typos

SyntaxError: invalid syntax

Question 3

what is print?

Answer 3

is a function used to display values placed inside the parentheses ( )

print(“Hi”)
print()
print(“How are you”)
“How are you” is a value that’s a string (a string of text)

Question 4

what is comment?

Answer 4

great for annotating and adding notes to your source code.
# ##Todo: eventually I should remove the line below…
# It’s fine for now tho
“””
this is only note
“””
You can have multiple comments — as many as you want!

Question 5

What is Value?

Answer 5

is a piece of data.

Values belong to categories called data types

Question 6

Data types

Answer 6

String - "Hello, world!", "!"
Integer - 1, 54679
Float - 3.14, -1.6
Boolean - True, False
None - None

Question 7

Variables

Answer 7

are used to store values so you can use them later

greeting = “Hello, world!”

Question 8

what is =?

Answer 8

is a assignment operator

Question 9

How to create a variable?

Answer 9

Valid characters are letters, numbers, and underscores

don’t start with a number

num_students
book_titles

Question 10

concatenate

Answer 10

The act of adding one string to another with + can be referred to as string concatentation.

Question 11

Strings

Answer 11

A string that’s an entire sentence, one character, symbols and numbers and surrounded by quotation marks.
“Hello, world!”
“a”
“! 3&*# 29”
You can use single quotes (‘) or double quotes (“)
But take care not to mismatch them!

Question 12

Integers

Answer 12

are whole numbers that can be signed (negative) or unsigned (positive)

A positive integer: 100
A negative integer: -1568
Can separate digits with underscore: 100_000
You can perform mathematical operations on integers.

Question 13

Integer operator:

Answer 13

Add +
Subtract -
Multiply *
Divide /

Question 14

integer sample:

Answer 14

Adding integers together
my_score = 100 + 5
print(my_score)

num_attendees = 5
total_prizes = 20
print(total_prizes / num_attendees)

Question 15

Floats

Answer 15

AKA floating-point numbers
They’re non-whole numbers (they can have a decimal point)

1. 5
   - 0.583

Question 16

Booleans

Answer 16

The Boolean data type has just two members:

True

False

sleepy = True
print(sleepy)
>True

Question 17

More Booleans samples:

Answer 17

sleepy = False
if sleepy:
    print("YAWN! x(")
else:
    print("I'm awake :)")

> I’m awake :)

Question 18

None

Answer 18

There’s only one value that’s a None-type — None

It represents the idea of nothingness, ex.: a missing value

fav_sport = None
You’ll learn more about it later — for now just know it exists.