Ch 2.

Question 1

What does ending .py mean?

Answer 1

The file is a python file

Question 2

What is a variable?

Answer 2

A symbolic representation of a value, can think of as a label for a value

Question 3

Rules for naming and using variables

Answer 3

1. Variable names can only contain letters, numbers and underscores.
2. Can start with a letter or underscore but NOT a number.
3. Spaces are not allowed
4. Do not use Python keywords and function names. (aka reserved words)
5. Names should be short but descriptive.
6. Be careful using lowercase l and uppercase O because it can be confused with 1 and 0.

Question 4

What is a string?

Answer 4

a series of characters

Question 5

change to upper case for first letters only?

Answer 5

variable_name.title()

Question 6

all upper case?

Answer 6

variable_name.upper()

Question 7

all lower case?

Answer 7

variable_name.lower()

Question 8

format strings

Answer 8

Python formats the string by replacing the name of any variable in braces with its value:
f”Hello, {variable_name}!”

Question 9

\t

Answer 9

adds tab

Question 10

\n

Answer 10

adds new line

Question 11

How to remove whitespace temporarily? Permanently?

Answer 11

Temp:
all: variable_name.strip()
for right: variable_name.rstrip()
or for left:  variable_name.lstrip()
Perm: You have to associate the stripped value with the variable name.

Question 12

When does a syntax error occur?

Answer 12

When python doesn’t recognize a section of your program as valid code.

Question 13

How do you assign values to more than one variable using a single line of code?

Answer 13

Using multiple assignment: x, y, z = 0, 0, 0

Question 14

How do you indicate a constant?

Answer 14

Using all caps. For example: MAX_CONNECTIONS = 5000