Exam 1

Question 1

What variables are mutable?

Answer 1

Lists, dictionaries and sets.

Question 2

What function converts a Unicode character to its integer representation?

Answer 2

ord()

Question 3

What function takes the integer representing a Unicode character and returns the character itself?

Answer 3

chr()

Question 4

How do you add a value to the end of a list?

Answer 4

list.append(value)

Question 5

How do you remove an item from a given index in a list?

Answer 5

list.pop( i )

Question 6

How do you remove an item who’s value is “abc” from a given list?

Answer 6

list.remove(“abc”)

Question 7

What function returns the length of a list?

Answer 7

len(list)

Question 8

How do you concatenate a given list “list1” to the end of another list “list2”?

Answer 8

list1 + list2

Question 9

How do you find the smallest value element of a given list?

And how do you find the largest?

Answer 9

min(list)

max(list)

Question 10

How do you find the sum of all elements in a list? (Numbers only)

Answer 10

sum(list)

Question 11

How do you count the number of instances of a given value that are in a list?

Answer 11

list.count(value)

Question 12

How do you find the index of (the first instance of) a given value in a list?

Answer 12

list.index(value)

Question 13

How would you concatenate the list “feb_temps” to the end of “jan_temps”?

Answer 13

jan_temps + feb_temps

Question 14

What is a tuple?

Answer 14

It stores a collection of data like a list, but is immutable.

It generally uses parenthesis ( ) instead of brackets [ ]

Question 15

What is a named tuple and how is it formatted?

Answer 15

example instance:

It is a container that defines a new simple data type consisting of named attributes.

Car = namedtuple(‘Car’, [‘make’, ‘model’, ‘price’]

chevy_impala = Car(‘Chevrolet’, ‘Impala’, 37495)

Question 16

How do you add a list/grouping of objects to a list?

Answer 16

list.extend[vals]

Question 17

How do you INSERT an object at a specific index?

Answer 17

x is inserted before the index ‘i’

list.insert(i, x)

Question 18

How do you sort the items of a list?

Answer 18

list.sort()

Question 19

How do you delete an object at a specific index from a list?

Answer 19

del my_list[ i ]

Question 20

How do you get a new list containing values from a specific range of indices of an existing list?

Answer 20

creates list new_list with values from indices 1-3 of og_list

new_list = og_list[1:3]

Question 21

What is the format for making a copy of a list?

Answer 21

including a colon with NO index range just copies the entire list

new_list = old_list[ : ]

Question 22

How do you check if a variable “x” is in a given list of values “my_list”?

Answer 22

true if it is the list, false otherwise.

if x in my_list: