Python -- Slicing

Question 1

How to know how many values are in a list?

Answer 1

len() function

Question 2

names = [‘Ran’, ‘Shinyan’, ‘Emilee’, ‘Amy’]
How to access ‘Shinyan’ in the list?

Answer 2

print(names[1])

Question 3

names = [‘Ran’, ‘Shinyan’, ‘Emilee’, ‘Amy’]
How to access ‘Amy’ in the list using 2 ways?

Answer 3

Method 1: print(names[3])
Method 2: print(names[-1])

Because 0 is the first value, if we count backward, ‘Amy’ will be our -1 value.

Question 4

What happens when you try to access an index that doesn’t exist?

Answer 4

You get an IndexError

Question 5

names = [‘Ran’, ‘Shinyan’, ‘Emilee’, ‘Amy’]
print(names[0:2])

What does this code evaluate?

Answer 5

Execute: [‘Ran’, ‘Shinyan’]
Up to but not including index number 2.

Question 6

my_list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
print(my_list[-7: -2])

What does this code evaluate?

Answer 6

Execute:[3, 4, 5, 6, 7]
Up to but not including -2

Question 7

my_list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
print(my_list[ : ])

What does this code evaluate?

Answer 7

Execute: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Question 8

my_list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Tell it to print in increments of 2

Answer 8

print(my_list[0:-1:2])
Execute: [0, 2, 4, 6, 8]