Notes:

Iteration: a repeating portion of an algorithm, repeats a specified number of times or until a given condition is met
Iteration Statements: change the sequential flow of control by repeating a set of statements zero or more times, until a stopping condition is met
Repeat Until: if the condition evaluates to true initially, the loop body is not executed at all, due to the condition being checked before the loop.
Traversing Lists: where all elements in the list are accessed, or a partial traversal, where only a portion of elements are accessed (can be a complete traversal)
- Complete Traversal: All elements in a list are assessed
- Partial Traversal: Only a given portion of elements are assessed
- Iterative Traversal: When loops are used to iterate through a list and to access each single element at a time.
insert( ) allows a value to be inserted into a list at index i
append( ) allows a value to be added at the end of a list
remove( ) allows an element at index i to be deleted from a list
length( ) returns the number of elements currently in a specific list

Hacks 3.8.1

Define an iteration

Part of an algorithm that repeats until a condition is met.

Make your own example of an iteration with at least 4 steps and a stopping condition (similar to mine that I did)

Wrapping Christmas Gifts:

i. there are n gifts that need to be wrapped

ii. grab gift to wrap

iii. grab wrapping paper

iv. wrap gift

v. repeat steps 2-4 until all gifts are wrapped

Program a simple iteration

schedule = ["calc", "bio", "engineering", "csp"]
i = 0
for x in schedule:
    print(schedule[i])
    i+=1

calc
bio
engineering
csp

Hacks 3.8.2

What is an iteration statement, in your own words?

Changing the order that code is ran by repeatedly looping a section of code until the condition is met

Create a descending list of numbers using a for loop

for x in range(10, 0, -1):
    print(x)

10
9
8
7
6
5
4
3
2
1

Using while loop, make a list of numbers which will form an output of 3,16,29,42,55,68,81

numbers = [3, 16, 29, 42, 55, 68, 81]
x = 0
while x < len(numbers):
    print(numbers[x])
    x=x+1

3
16
29
42
55
68
81

Hacks 3.10

Find the lowest value in a list

nums = ["10", "15", "20", "25", "30", "35"]
potentialMin = nums[0]
for item in nums:
    if item < potentialMin:
        potentialMin = item

print("The minimum number in the list is:", potentialMin)

The minimum number in the list is: 10

Look at the APCSP Reference Sheet and take notes about ones you don't understand (at least 4)
- Assign the value of x to aList[i]
  
  aList[i] <- x
- Any values in aList at indecies >= i are shifted one position to the right. Length of list is increased by 1, value is plaed at index i in aList
  
  insert(aList, i, value)
- Appends aList in increased by 1, and value placed at end of aList
  
  append(aList, value)
- Remove the item at index i in aList and shifts to the left any values at indices greater that i. The length of aList is decreasing by 1
  
  remove(aList, i)

List's Quiz

import getpass, sys
import random

def ask_question (question, answer):

    print(question)
    ans = input(question)
    print(ans)
   
    if ans == answer:
        print("Correct!")
        return 1

    else:
        print("Wrong")
        return 0

question_list = ["What allows a value to be inserted into a list at index i?" , "What allows an element at index i to be deleted from a list?" , "What returns the number of elements currently in a specific list?" , "What allows a value to be added at the end of a list?"]
answer_list = ["index()", "remove()", "length()" , "append()"]

# Set points to 0 at the start of the quiz
points = 0

# If the length of the quiz is greater than 0, then random questions will be chosen from the "question_list" set
while len(question_list) > 0:
    index = random.randint(0, len(question_list) - 1)
    
# The points system where a point is rewarded for each correct answer    
    points = points + ask_question(question_list[index], answer_list[index])
    
# If a question or answer has already been used, then it shall be deleted    
    del question_list[index]
    del answer_list[index]

# Calculating score using the points system and dividing it by the total number of questions (6)
score = (points / 4)

# Calculating the percentage of correct answers by multiplying the score by 100
percent = (score * 100)

# Printing the percentage, and formatting the percentage in a way where two decimals can be shown (through "{:.2f}")
print("{:.2f}".format(percent) + "%")

# Adding final remarks based upon the users given scores
if points >= 5:
         print("Your total score is: ", points, "out of 4. Amazing job!")

elif points == 4:
         print("Your total score is: ", points, "out of 4. Not too bad, keep on studying! " )

else:
         print("Your total score is: ", points, "out of 4. Its alright, better luck next time!")

What allows a value to be added at the end of a list?
append()
Correct!
What allows an element at index i to be deleted from a list?
remove()
Correct!
What returns the number of elements currently in a specific list?
length()
Correct!
What allows a value to be inserted into a list at index i?
index()
Correct!
100.00%
Your total score is:  4 out of 4. Not too bad, keep on studying!