week 6 nested loops

Question 1

while

Answer 1

executes code as long as statement is true, you want it to be the condition you don’t want so it runs until it meets you goal

Question 2

while loop syntax

Answer 2

while (condition):
# code

Question 3

sentinel while loop

Answer 3

has expected value, loops run while you don’t have the expected value

Question 4

counting while loop

Answer 4

loop runs a set number of times and the iteration value is increased inside the while loop

Question 5

for loops

Answer 5

initializes increment value and step size within first line

Question 6

for i in range(1, 4, 1):

what is the significance of each number?

Answer 6

1 is the initial value (inclusive)
4 is end value (exclusive)
1 is step size

Question 7

range(5)

Answer 7

0 1 2 3 4

Question 8

for each

Answer 8

for loops iterates over container and accesses each element of the container

Question 9

for each syntax

Answer 9

for ch in text:
# code

Question 10

loop

Answer 10

program construct that repeatedly execute statements based on set conditions

Question 11

iterations

Answer 11

each time through the loop’s statements are executed

Question 12

loop body

Answer 12

code inside the loop

Question 13

sentinel value

Answer 13

expected value you want to reach after the loop is executed

Question 14

infinite loop

Answer 14

loop will always execute because expression is always true

Question 15

how do you exit an infinite loop?

Answer 15

ctrl-c

Question 16

docstring

Answer 16

multi-line string literal delimited at start and end with triple quotes ‘’’

Question 17

random.randint()

Answer 17

function that generates random integer

Question 18

random.randint(0, 2)

Answer 18

generates random int between 0 and 2 (2 exclusive)

Question 19

loop variable

Answer 19

counts number of loop iterations and is updated in the loop body

Question 20

count down

Answer 20

can be done by decreasing the loop variable

Question 21

uses of a for loop

Answer 21

updating elements of a container, printing certain elements, checking each elements, etc

Question 22

reversed() function

Answer 22

goes through list backwards

Question 23

when to use for loop versus while loop

Answer 23

for:
iterations are computable before entering loop
accessing containers

while: iterations not computable before entering loop

Question 24

nested loop

Answer 24

loop within a loop, consists of inner and outer loop