W3 - Formatting

Question 1

What is a script?

Answer 1

collection of code in a single file, non-interactive (run all at once, like java, and none of the weird python interaction weve been doing lately) (and also no return unless printed!)

Question 2

what is a program

Answer 2

code in a script

Question 3

there are three code execution types: individually, in code cells, and in scripts. which does jupyter notebooks do?

Answer 3

code cells!

Question 4

files with scripts are named with…

Answer 4

a .py at the end

Question 5

what is a docstring

Answer 5

strings in 3 quotation marks, for longer comments and descriptions of user-made functions

Question 6

write a prompt asking me to type something, then if i type ‘something’ it will print ‘bro you suck’

Answer 6

str = input(‘type something: ‘)
if (str == ‘something’):
print(‘bro you suck’)
else:
print(‘thanks’)

Question 7

can == be used on python strings?

Answer 7

YES!

Question 8

true/false: print lines create a new line after every finished print

Answer 8

false though it does, use the \n or the newline character when not specified, having a comma and the end = ‘whateveryouwantit to end with’ command ends it with whatever you put in there

Question 9

what type are inputs returned as by the input function?

Answer 9

strings and strings ONLY

Question 10

how to put a quotation mark in a print

Answer 10

' (single quote string)
or
" (double quoted string)
or
“ OR ‘ (depending on the quotation marks the string uses, it will allow the opposite to exist without explicity using a backslash

Question 11

what is an f-string?

Answer 11

stands for formatted string

created via a f or F put in front of a string, allows you to put an int into a print or string like this
morality = ‘evil’
print(f’ur mum is {morality}’)

OUTPUT:
ur mum isevil

^note the lack of spaces

Question 12

true/false: The input function can read directly into an integer variable

Answer 12

false

Question 13

Which of the following are true? Check all that apply.

A. The input function always reads the user’s input as a string

B. Comments are executed by Python

C. When the newline character is printed, the cursor immediately moves down to the next line

D. Every print function prints a separate line in the output

Answer 13

A and C

Question 14

what is worn code?

Answer 14

disgusting code understood only when you write it, never understandable w/o comments (write once, read never)

Question 15

3 ways to print int variable in str with/without format: (no typecasting!)

Answer 15

print(‘Nobody expects the’, unexpected1, ‘!’)
^basic print we’re used to, adds a space as opposed to the formatted prints

print(f’Nobody expects the {unexpected2}!’)
^formatted, thus curly braces

print(f’Nobody expects the{unexpected3:25s}!’)
^formatted with 25 total spaces allotted (and taken up by the string), and as its a string it is put to the left

Question 16

strings are _____ justified, ints are ______ justified, and floats are ______ justified

Answer 16

left, right, right

Question 17

what is the string format specifier? float? int?

Answer 17

s, f, d

Question 18

print a float with a field width of 8 and 2 decimal numbers

Answer 18

print(f”The float entered is {myfloat:8.2f}”)

Question 19

what are the g and e specifiers?

Answer 19

g is for general format of floats, e is for scientific notation of floats.

g rounds to six total digits (left or right of decimal point). if the # of whole numbers exceeds 6, g converts the float into scientific notation to keep it at 6 digits.

ex.
pi = 3.1415926535
print(“what is {pi:g}”)
would return
what is 3.14159

print(f’The value is ${7223344.9912313123123:g}.’)
would return
The value is 7.22334+e06

or

print(“what is {pi:e}”)
would return
what is 3.141592e+00

Question 20

f vs g operator

Answer 20

f rounds to 6 decimals, g to 5

Question 21

print the float variable myfloat in e format

Answer 21

print(f’{myfloat:e}’)

Question 22

Write statements that will prompt the user for their favorite integer, and store it in an integer variable named favint.

Answer 22

string = input(“what’s your favorite integer? “)
favint = int(strint)

Question 23

how do you justify a formatted string left or right?

Answer 23

use the > or < symbol (pointing at the direction you want to justify)

ex. print(f’The string is {“hi there”:>12s}!!’)

justifies to the right
print(f’The string is {“hi there”:<12s}!!’)

justifies to the left

Question 24

true/false: printing a formatted string with a specified field width and a decimal length, such as 6.3f, will result in a value with the length and decimals NOT INCLUDING the decimal point

Answer 24

false, always includes decimal point

Question 25

what will this return: print(f'The value is ${79.99:3.2f}.')

Answer 25

The value is $79.99. python does not remove any digits/the decimal point despite the field width being smaller than the float.

Question 26

what will this print: print(f'And now for: {myword= :>10s}!!')

Answer 26

And now for: myword= cool!!

Question 27

what is an execution time error?

Answer 27

error caused by something found only during runtime (divide by a variable, variable is set to 0)

Question 28

what is the standard python indentation?

Answer 28

4 spaces (not tab!)

Question 29

what works as effectively a BOOLEAN version of indexOf() in python?

Answer 29

in

Question 30

what is elif?

Answer 30

python for else if if num < 0: code elif num == 0: blah

Question 31

what does a semicolon do?

Answer 31

nothing in python, but in jupyter notebook, it suppresses the output thats normally printed out automatically (of the last line)

Question 32

Simplify this statement: if num < 0: num = 0; else: num = num;

Answer 32

if num < 0: num = 0

Question 33

Simplify this statement: if val >= 4: print('ok') elif val < 4: print('smaller')

Answer 33

if val >= 4: print('ok') else print('smaller')

Question 34

how to check if string is numbers, letters, and letters or numbers

Answer 34

x.isdigit() x.isalpha() x.isalnum()

Question 35

what does x.islower() and x.isupper() return? how does this compare to x.lower() and x.upper()?

Answer 35

true or false, .lower() and .upper() return the actual upper and lower values. they could be set equal to the current strings to see if true or false.

Question 36

how to use in keyword

Answer 36

check if x is in y? x in y

Question 37

are formatted floats rounded or truncated?

Answer 37

rounded

Question 38

for i in range(2) what will the final value of i be?

Answer 38

1