Zybooks L3

Question 1

print floating number two digits after decimal

Answer 1

print(f’{myFloat:.2f}’)
print(f’{math.pi:.2f}’)
print(f’{(7.0/3.0):.2f}’) outputs 2.33.

Question 2

int(input())

Answer 2

when working with whole numbers

Question 3

float(input())

Answer 3

when working with decimals

Question 4

expression

Answer 4

combination of items, like variables, literals, operators, and parentheses, that evaluates to a value, like 2 * (x + 1)

Question 5

literal

Answer 5

a specific value in code like 2

Question 6

operator

Answer 6

a symbol that performs a built-in calculation, like +, which performs addition. Common programming operators are shown below

Question 7

exponent operator: **

Answer 7

x ** y (x to the power of y)

Question 8

compound operators

Answer 8

shorthand way to update a variable
age += 1 age = age + 1
age -= 1
age *= 1
age /= 1

Question 9

The division operator / performs division and returns a floating-point number.

Answer 9

20 / 10 is 2.0

Question 10

floor division operator // can be used to round down the result of a floating-point division to the closest smaller whole number value.

Answer 10

20 // 10 is 2

Question 11

The modulo operator (%) evaluates the remainder of the division of two integer operands

Answer 11

9 % 5 is 4. Reason: Since 9 = 5 * 1 + 4, the floor division 9 // 5 results in 1, and the remainder is 4

Question 12

module

Answer 12

a file containing Python code that can be used by other modules or scripts

Question 13

import statement

Answer 13

referencing and making another module available for use

Question 14

python’s randrange()

Answer 14

method generates random integers within a specified range
random.randrange(10) returns an integer with 10 possible values: 0, 1, 2, …, 8, 9

Question 15

python defined range code:
randint(min,max)

Answer 15

print(random.randint(12,20))
returns a randon integer between 12 and 20 inclusive

Question 16

python defined range code:
randrange(min,max)

Answer 16

returns a random integer between min and max -1 inclusive
print(random.randrange(12,20)
- returns a random integer between 12 and 19 inclusive

Question 17

seed // seed() method

Answer 17

program can specify the seed by calling seed() method. i.e. random.seed(5) // with a specific seed, each program run yields the same sequence of psuedo-random numbers
- for the first call to any random method (no previous random method exists), computer uses built-in integer based on current time to help generate a random number

Question 18

unicode

Answer 18

python uses Unicode to represent every possible character as a unique number, known as a code point

Question 19

escape sequence

Answer 19

the interpreter recognizes \ as the start of a special character’s two-item sequence
- print(‘\home\users\’) -> \home\users\
- print(‘Name: John O'Donald’) -> Name: John O’Donald
- print(“He said, "Hello friend!"”) -> He said, “Hello friend!”
- print(‘My name…\nIs John…’) -> My name…
Is John…
- print(‘1. Bake cookies\n\t1.1. Preheat oven’) ->
1. Bake cookies
1.1. Preheat oven

Question 20

raw string

Answer 20

escape sequences can be ignored
- my_raw_string = r’This is a \n 'raw' string’
This is a \n 'raw' string