learn-ch4-objects

Question 1

what is the syntax for creating a list of integers?

Answer 1

l = [1,2,3]

Question 2

Can you nest a list within a list?

Answer 2

yes

Question 3

There are two different ways to create a dictionary with name, value. What are they?

Answer 3

d = {'name': 4}
d = dict(name=4}

Question 4

name 3 sequence types

Answer 4

lists, tuples, strings

Question 5

what is the built-in function to return the length of a sequence?

Answer 5

len()

Question 6

for pyhthon sequence types, what is the syntax to access the first element?

Answer 6

str[0] . it’s the braces and the offset. The offset starts at 0.

Question 7

how to index backwards i.e. from right to left

Answer 7

use negative numbers str[-1]

Question 8

what is the syntax for taking a slice of a string?

Answer 8

s = str[1:4]

Question 9

what is the syntax for concatenation of sequences?

Answer 9

use the + between two sequences

Question 10

In Python, are strings immutable?

Answer 10

yes

Question 11

Are sequences immutable?

Answer 11

yes

Question 12

If sequences are immutable, how can one concatenate two sequences?

Answer 12

They are combined into a new sequence

Question 13

what function can be used to return all methods for a sequence?

Answer 13

dir(list3)

Question 14

what function will bring up Pydoc for a type or method

Answer 14

help(type) or help(method)

Question 15

how do you create a int literal in hexadecimal?

Answer 15

0xA . this is 10

Question 16

what is the use of the ‘’’ triple quotes?

Answer 16

string literal that is multi-line

Question 17

How do you use the raw string? when is this useful?

Answer 17

r’~/Documents/Projects/Python/main.py’ - disables escape