Lecture 2 - Loops

Question 1

A way to do something over and over again.

Answer 1

Loops

Question 2

a type loop will repeat a block of code over and over again

Answer 2

While

Question 3

While Syntax

Answer 3

i = 3
while i != 0:
print(“meow”)

Question 4

When you get stuck in a loop that executes forever, you can press ________________ on your keyboard to break out of the loop.

Answer 4

Control + C

Question 5

One cycle through a loop

Answer 5

Iteration

Question 6

This loop iterates through a list of items.

Answer 6

For

Question 7

Data type used to store multiple items in a single variable.

Answer 7

List

Question 8

For Syntax

Answer 8

for i in [0, 1, 2]:
print(“meow”)

Question 9

This function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and stops before a specified number.

Answer 9

Range()

Question 10

Range() Syntax

Answer 10

Range(start, stop, step)

Question 11

This keyword explicitly tells Python to go to the next iteration of a loop.

Answer 11

Continue

Question 12

This keyword tells Python to “break out” of a loop early before it has finished all of its iterations

Answer 12

Break

Question 13

Continue & Break Syntax

Answer 13

while True:
n = int(input(“What’s n? “))
if n < 0:
continue
else:
break

Question 14

This function returns the number of items in an object.

Answer 14

Len()

Question 15

Len() Syntax

Answer 15

mylist = [“apple”, “banana”, “cherry”]
x = len(mylist)

Question 16

A data structure that allows you to associate keys with values.

Answer 16

Dict

Question 17

These keys are used to create a dictionary

Answer 17

{}

Question 18

Dict {} Syntax

Answer 18

students = {
“Hermoine”: “Gryffindor”,
“Harry”: “Gryffindor”,
“Ron”: “Gryffindor”,
“Draco”: “Slytherin”,
}
print(students[“Hermoine”])
print(students[“Harry”])
print(students[“Ron”])
print(students[“Draco”])

Question 19

Parameter that enables results to seperate by a comma (or whatever other character/s are used)

Answer 19

sep=”, “

Question 20

Sep Syntax

Answer 20

for student in students:
print(student, students[student], sep=”, “)

Question 21

This keyword is used to define a null value, or no value at all.

Answer 21

None

Question 22

None Syntax

Answer 22

students = [
{“name”: “Hermoine”, “house”: “Gryffindor”, “patronus”: “Otter”},
{“name”: “Harry”, “house”: “Gryffindor”, “patronus”: “Stag”},
{“name”: “Ron”, “house”: “Gryffindor”, “patronus”: “Jack Russell terrier”},
{“name”: “Draco”, “house”: “Slytherin”, “patronus”: None},
]