Beginner Python Cheat Sheet - Lists (Python Crash Course)

Question 1

What does .insert() do and what are the arguments?

Source: http://ehmatthes.github.io/pcc/cheatsheets/README.html

Answer 1

The first argument is an integer indicating position. The second is the item to insert into the list. If you want to add to the end, then use ‘append’.

Question 2

What does .pop() do and what are the arguments?

Answer 2

pop removes the last item of the list so you can work with it as a variable. The argument is optional and is a integer that indicates a position in the list that you would like to pop.

Question 3

What is the keyword for deleting an element in a list by position?

Answer 3

It’s “del”

E.g.

del users[-1]

Del is also used to delete objects in general

Question 4

What is the keyword for deleting an element in a list by its value?

Answer 4

“remove”

E.g. users.remove(‘mia’)

Question 5

What function do you use to get the length of a list?

Answer 5

len()

Question 6

How do you temporarily sort a list?

Answer 6

sorted()

E.g.
print(sorted(users, reverse=True))

Question 7

How do you permanently sort a list?

Answer 7

.sort() method

E.g.
users.sort(reverse=True)

Question 8

How do you reverse the order of a list?

Answer 8

.reverse() method

E.g.
users.reverse()

Question 9

How do you copy a list so that changes to the new list don’t affect the original?

Answer 9

E.g.

finishers = ['kai', 'abe', 'ada', 'gus', 'zoe']
copy_of_finishers = finishers[:]

Question 10

How would you write a list comprehension to capitalize all the letters in a list?

Answer 10

E.g.
names = [‘kai’, ‘abe’, ‘ada’, ‘gus’, ‘zoe’]
upper_names = [name.upper() for name in names]