Python - standard

Question 1

Create a list comprehension consisting of squares of the elements from another list

Answer 1

new_list = [ i**2 for i in old_list ]

Question 2

Create an equivalent list comprehension for the following:

new_list = []
for letter in ‘abcd’:
for num in range(4):
new_list.append( (letter, num) )

Answer 2

new_list = [ (letter, num) for letter in ‘abcd’ for num in range(4) ]

Question 3

Create a list comprehension that filterers another list for only odd numbers

Answer 3

new_list = [ i for i in old_list if i%2 != 0 ]

Question 4

Create an equivalent list comprehension for the following:

names= ['Bruce', 'Clark', 'Peter']
heroes= ['Batman', 'Superman', 'Spiderman']

new_dict= {}
for name, hero in zip(names, heroes):
new_dict[name] = hero

Answer 4

new_dict = { name: hero for name, hero in zip( names, heroes) }

Question 5

Create a lambda function that cubes an input value

Answer 5

lambda x: x **3

Question 6

Convert the following into one line of code

if x > y:
print(‘x is bigger’)
else:
x*y

Answer 6

print(‘x is bigger’) if x>y else x*y

Question 7

Get a list of the keys from a dictionary

Answer 7

dict.keys()

Question 8

Get a list of tuples of key-value pairs from a dictionary

Answer 8

dict.items()

Question 9

Get a list of the values from a dictionary

Answer 9

dict.values()