Chapter 5: Repetition

Question 1

Types of Repetition:

Answer 1

1. Fixed Repetition
2. Variable Repetition

Question 2

The number of repetitions in FIXED REPETITION…

Answer 2

…can be determined in advance

Question 3

the number of loops in a FIXED REPETITION is….

Answer 3

INDEPENDENT of what happens inside the loop

Question 4

number of times a code will be repeated in VARIABLE REPETITION….

Answer 4

…CANNOT BE DETERMINED

Question 5

Counter-controlled loops

Answer 5

• also known as “counting loops”
• controlled by a var whose value represents a counter
• implement FIXED REPETITION
• FOR & WHILE loop

Question 6

Event-driven loops

Answer 6

• “Conditional loops”
• implement VARIABLE REPETITION
• WHILE loop

Question 7

keyword break function:

Answer 7

• immediately terminate a loop
• continue w the next statement after loop

Question 8

keyword “continue” function:

Answer 8

ends current iteration and goes to the end if the loop

Question 9

list[-2] is the same as list[-2 + len(list1)] in the sense that both gives..

Answer 9

the SECOND LAST element in the list

Question 10

List Slicing [start:end]

Answer 10

slice is a sublist from index start to index end-1

list1=[2,3,5,7,9,1]
list1 [2:4] #4-1
[5, 7]

Question 11

in list:
positions != index
index = position - 1

Answer 11

extra notes

Question 12

append()

Answer 12

adds an element at the end of list

Question 13

count()

Answer 13

return the number of elements with specified value

Question 14

insert()

Answer 14

adds an element at the specified POSITION

Question 15

pop()

Answer 15

removes element at the specified position

Question 16

remove()

Answer 16

removes element with the specified position

Question 17

sort()

Answer 17

sorts the list in ascending matter

Question 18

TUPLES

Answer 18

• elements are FIXED
• cannot add new elements, delete, replace nor reorder

Question 19

functions for both list and tuple

Answer 19

1. len
2. max()
3. sum()
4. min()
5. shuffle()

Question 20

For-loop Format

Answer 20

for i in range({finalValue}):
assume initialValue is 0

({initialVal},{finalValue}):

in range({initialValue},{finalValue},{stepValue})

Question 21

Nested loop

Answer 21

1. consist of outer loop+inner loop
2. each time the outer is repeated, inner loop are reentered started anew