Class Review

Question 1

True or False: Python is a proprietary, expensive, difficult-to-learn language owned by Microsoft?

Answer 1

False

Question 2

What is a literal?

Answer 2

A hard-coded instruction - literally this string, this number, etc.

Question 3

What is the character for single-line comments?

Answer 3

#

Question 4

What is the escape sequence for a single quote within a string?

Answer 4

'

‘I don't want eggs for breakfast.’

Question 5

What is the character limit for a single line according to the Python Style Guide?

Answer 5

79 characters

Question 6

What are the three keywords for conditional “IF” flow control structures?

Answer 6

if, elif, else

Question 7

Does python use braces for controlling application flow?

Answer 7

No - it uses tabs - spacing!

Question 8

Does python use static or dynamic data typing for variables? (Hint: duck typing)

Answer 8

Dynamic typing - duck typing - if it walks like a duck and acts like a duck… it’s a duck!

Question 9

What do we call objects that can return their members one at a time?

Answer 9

Iterables

Question 10

What are Python lists similar to in other languages?

Answer 10

Arrays

Question 11

Which types of sequences are immutable?

Answer 11

Tuples, strings

Question 12

What are generator expressions?

Answer 12

Iterables that can only be iterated through once

Question 13

When files are read into python, what does python store them in?

Answer 13

File objects

Question 14

What are the different options to sort on with the sorted function?

Answer 14

Existing functions, lambda functions, reversed

Question 15

Does python provide keywords for handling exceptions?

Answer 15

Yes! Try, except, else, finally.

Question 16

Can you create custom functions in python?

Answer 16

Yes!
def [function name](parameter):
    # pass

Question 17

What are the different ways for one module to use another?

Answer 17

from [module] import [function]
from [module] import *
import [module]

Question 18

What is the .pyc extension file?

Answer 18

compiled python files

Question 19

Where does python search for modules?

Answer 19

Current directory, standard library, and sys.path

Question 20

What are some of the string methods commonly used in our class?

Answer 20

string. join(sequence) - shortcut for a for loop for joining strings
string. split(‘delimiter’) - split by character within parens - default space
string. lower() - lowercase
string. strip(‘character’) - strip characters from both sides of string - default all whitespace

Question 21

How do you format strings in python? (new way)

Answer 21

f’string {variable} {expression}

‘string {index 0} {index 1}’.format(variable, expression)

Question 22

How do you read arguments from the command line?

Answer 22

import sys

sys. argv is a list of arguments
sys. argv[0] = file name

all other arguments separated by space on command line.

Question 23

What are two ways to short-circuit a loop?

Answer 23

continue - go to the top of the loop

break - exit out of the loop and move on to the next code (if any)

Question 24

How do you slice an array? Bonus: how do you slice an array backwards?

Answer 24

[start:stop:step] default start: 0; default stop: end of array; default step: 1

index 0 through 10:
[:11]

index 2 through 14 by 2s:
[2:15:2]

backwards by 5s:
[30:0:-5]