Python 3 - Beginner

Question 1

What is a string?

Answer 1

a sequence of characters enclosed by single, double, or triple quotes

Question 2

What is the escape sequence for a new line?

Answer 2

\n

Question 3

What are the 2 main types of numbers?

Answer 3

Integers (int) and Floats (float)

Question 4

What does the % operator do?

Answer 4

Returns the remainder after division of one number by another

Question 5

What does the // operator do?

Answer 5

Integer division

Question 6

What does the abs() function do?

Answer 6

Returns the distance between the number in parentheses and 0

Question 7

What is a Boolean?

Answer 7

A True or False value

Question 8

What does the Not operator do?

Answer 8

The Not operator means denying an expression.

Question 9

What is a List?

Answer 9

a data structure in Python that is a mutable, or changeable, ordered sequence of elements. Items in a list are enclosed with [ ] brackets

Question 10

What is a set?

Answer 10

An unordered collection of unique elements. Sets are enclosed in { } curly brackets

Question 11

What is a tuple?

Answer 11

Tuples are immutable lists (their contents cannot be changed by adding, removing, or replacing elements). Tuples are enclosed in ( ) round brackets.

Question 12

What is a frozenset?

Answer 12

Frozensets are immutable sets.

Question 13

What are Ranges?

Answer 13

The range() function is used to generate a sequence of numbers over time. (start, end, step)

Question 14

What are dictionaries?

Answer 14

a dictionary is an unordered set of key value pairs.

dict1 = { “1”: “One”, “2”: “Two”}

Question 15

How do if/elif/else statements operate?

Answer 15

code is executed based on one or more conditions being evaluated as True or False. Once conditions are met, the code is run and any code following is ignored.

Question 16

What symbol should follow an if/elif/else statement?

Answer 16

a colon :

Question 17

How many spaces should code be indented following an if/elif/else statement?

Answer 17

4 (TAB)

Question 18

What is a For loop?

Answer 18

a For loop executes a block of code a number of times depending on the sequence it iterates on. The “else” clause is optional.

Question 19

What is the syntax of a for loop?

Answer 19

for x in item
x is any temporary variable.
item can be any object including ranges

Question 20

What does the enumerate function do?

Answer 20

It allows us to loop over something and have an automatic counter. It also also accepts an optional argument which makes it even more useful.

for counter, value in enumerate(some_list):
print(counter, value)