Chapter 3 (strings)

Question 1

What are the types of sequences?

Answer 1

• String
• List
• Tuple

Question 2

What are the properties of a string?

Answer 2

• Immutable, must be assigned a new string
• Only stores single characters in a sequence
• Can be iterated by element

Question 3

What are the properties of a list?

Answer 3

• Mutable
• Can hold any data type
• Can hold more than one character per index
• Can be iterated by element

Question 4

What are the properties of a tuple?

Answer 4

• Immutable
• Can hold any data type
• Can hold more than one character per index
• Can be iterated by element

Question 5

What is the notation for finding the element of a sequence type by index?

Answer 5

sequence[index]

Question 6

What is the only mapping type in Python?

Answer 6

Dictionary

Question 7

What makes a mapping type different from a sequence type?

Answer 7

Both act as containers that hold values, but the mapping types are not ordered, their contents cannot be searched using an index number
- A dictionary uses a key-value pairs instead of index-value pairs

Question 8

What is a set?

Answer 8

A separate type from mapping or sequence types, simply an unordered list of unique elements

Question 9

How do you declare an empty and prefilled list?

Answer 9

Empty) list = []
Prefilled) list = [1,2,3,4,5]

Question 10

How do you declare an empty and prefilled tuple?

Answer 10

empty) tuple = ()
prefilled) tuple = (1,2,3,4)

Question 11

How do you declare an empty and prefilled dictionary?

Answer 11

Empty) dict = {}
Prefilled) dict = {‘joe’: 18, ‘Dan’: 19}
dict = {key:value}

Question 12

How do you limit the number of decimal places in an output?

Answer 12

~ let x be the number of values after the decimal point

print(f’{value:.xf}’)

Question 13

How do you find the length of a sequence?

Answer 13

len()

Question 14

How do you find the final value in a sequence?

Answer 14

sequence[-1]
- indexing works as a circle, so you [0] is the first and [-1] is the last, you can keep going back the sequence as long as you don’t exceed the first value of the sequence
- e.g. name =’danial’ name[-12] would create an error

Question 15

what is the function of \?

Answer 15

Ignore the following character in a print statement

Question 16

What is the format for deleting index in a lists

Answer 16

Del list[index]

Question 17

What is the Pop() function format

Answer 17

List.pop(index)
List.pop() auto does last

Question 18

How do you declare an empty and prefilled tuple?

Answer 18

empty) tuple = ()
prefilled) (1,2,3,4)