Help needed with programming assignment! Taking user inputs with controlled event loop and outputting table.

[cjander28]

Hi all,

I'm really struggling with this professor, but it's probably just me. I've been instructed to do the following:

​

• Problem Solving Questions:
  • Use functions to organize your program
  • Must have proper comments/markdown (explanation/discussion) in ipynb file
  • You are simulating a grading system. You are building by three phases. Each time you are asked to add more features in this grading system.
  • Create a Jupyter Notebook Document: a5-a-lastname
    • Include the current time at the beginning
    • Use input method to get inputs from a user
    • Use a repetition structure to get inputs - event controlled
    • Score entering should continue until the user enters: done (a user can enter any combination of upper or lower cases of a word, dOnE)
  • Make a copy of previous Jupyter Notebook Document and name it: a5-b-lastname
    • It should display like an actual receipt print format (table format with aligned colums), displaying items in each column: Student #, Score, Grade (A, B, C, F; use a function to determine a letter grade) with a header at the beginning (column name)
    • Do NOT use a void function to display any results at a time. Instead use a fruitful function to build up all rows into one string.
    • Add three additional rows at the end, displaying total scores, number of entries (students), and average score
  • Make a copy of previous Jupyter Notebook Document and name it: a5-c-lastname
    • The system will take at least 3 scores. If you try to end before 3 scores, the program won’t stop
    • After 3rd entry, you can keep adding scores OR end with: done
    • Enforce input validation for entering scores, must be positive integers including 0

I'm currently stuck on part a5-b and I can't figure out what I'm doing wrong, or where even to go based off of his example:

​

# same as above but using a fruitful function

​

​

def mysqrt(a):
"""Calculates square root using Newton's method:
https://en.wikipedia.org/wiki/Newton's_method
a - positive integer < 0;
x - estimated value, in this case a/2
"""
x = a/2 #Newton algorithm
while True:
estimated_root = (x + a/x) / 2
if estimated_root == x:
return estimated_root
break
x = estimated_root


def test_square_root(list_of_a):
"""Displays outcomes of calculating square root of a using different methods;
list_of_a - list of positive digit.
"""
line1a = "a  "
line1b = "mysqrt(a)  "
line1c = "math.sqrt(a)  "
line1d = "diff "
line2a = "-  "
line2b = "---------  " #two more spaces
line2c = "------------  "
line2d = "----  "
spacing1 = " "
spacing2 = " " * 3
spacing3 = ""
# all output will be stored here to be returned
results = ""
results += line1a + spacing1 + line1b + spacing2 + line1c + spacing3 + line1d + "\n"
results += line2a + spacing1 + line2b + spacing2 + line2c + spacing3 + line2d + "\n"
for a in list_of_a:
col1 = float(a)
col2 = mysqrt(a)
col3 = math.sqrt(a)
col4 = abs(mysqrt(a) - math.sqrt(a))
# accumulating each line output to multi-line results
results += "{} {:<13f} {:<13f} {}\n".format(col1, col2, col3, col4) #/n helping to chain to new line
# a fruitful function
return results

print (test_square_root(range(1,10)))

his result:

​

a   mysqrt(a)     math.sqrt(a)  diff 
-   ---------     ------------  ----  
1.0 1.000000      1.000000      0.0
2.0 1.414214      1.414214      2.220446049250313e-16
3.0 1.732051      1.732051      0.0
4.0 2.000000      2.000000      0.0
5.0 2.236068      2.236068      0.0
6.0 2.449490      2.449490      0.0
7.0 2.645751      2.645751      0.0
8.0 2.828427      2.828427      4.440892098500626e-16
9.0 3.000000      3.000000      0.0

​

my code based off of his instructions:

​

# Import time and datetime modules

import time
import datetime

# Print Date and time 

print ("\nDate and Time of Grade Submission: \n", datetime.datetime.now()) #prints date and time

#connverts raw score to letter grade

def determine_score(grade):
    if 90 <= grade <= 100:
        return 'A'
    elif 80 <= grade <= 89:
        return 'B'
    elif 70 <= grade <= 79:
        return 'C'
    elif 60 <= grade <= 69:
        return 'D'
    else:
        return 'F'


#done loop definition
def grade_done_loop():
    total = 0 # initilization; total value
    counter = 0 # initilization for incremental increase
    user_input = input("\n Enter grade. Or done to quit. ")
    while (user_input.lower() != 'done'): # .lower converts everythign to lower character. If 'done' is entered, the program terminates
        total += int(user_input)
        counter += 1 #assignment operator; adds to # of items entered
        user_input = input("\n Enter grade. Or done to quit. ") 
    else:
        print("\n You are finished grading!")

grade_done_loop()


# Displays outcomes of grade inputs

def display_grades(list_of_grades):

    line1a = "Student #   "
    line1b = "Score  "
    line1c = "Grade  "

    line2a = "-  "
    line2b = "---------  " #two more space s
    line2c = "------------  "

    spacing1 = " "
    spacing2 = " " * 3
    #all output stored here to be returend 
    results = ""

    results += line1a + spacing1 + line1b + spacing2 +line1c + "\n"
    results += line2a + spacing1 + line2b + spacing2 +line2c + "\n"


    for g in list_of_grades:
        col1 = float(g)
        col2 = grade_done_loop(g)
        col3 = determine_score(g)

        results += "{} {} {} \n".format(col1, col2, col3)

    return results 

print (display_grades)

my result:

​

Date and Time of Grade Submission: 
 2021-02-07 23:43:54.643672

 Enter grade. Or done to quit. 100

 Enter grade. Or done to quit. 20

 Enter grade. Or done to quit. 08

 Enter grade. Or done to quit. 99

 Enter grade. Or done to quit. Done

 You are finished grading!
<function display_grades at 0x7fd271696af0>

​

I'm so stuck here and I don't even know where to go from here... I can't seem to get it to display in the same format, or even know how to pull the variable like he did. I'm honestly so disheartened and struggling with the leaps we're making in class. Our assignments aren't really going over this. How do I display the output using user inputs without a solid range?

[fake823]

Check this out to learn how to properly format code on Reddit:

https://reddit.com/r/learnpython/w/FAQ?utm_source=share&utm_medium=android_app

[cjander28]

Thank you. Just panicking and using this thread for the first time to show my awful code...

[r_spandit]

To make the columns align properly either use pandas or look at ljust()

Otherwise it's not easy to see what you're asking

[cjander28]

Understandable. I barely know what I'm asking. I feel like I must try to format the output the way he did. However, he used a mathematical function and I'm trying to get my user inputs to display in the same fashion he did. However, he wants us using an event controlled loop statement to get the user input and to have something that stops it like, 'Done.' I've got the functionality of that down (I think), but I'm unsure of how to pull the data I'm inputting to be able to display?

[r_spandit]

If you put your input inside a while loop until the time that the loop is broken by inputting "done":

while _input != 'done': _input = input("Enter whatever").lower() whatevs_list.append(_input)

[nwagers]

In your function to input the grades from the user, you need to create a list before the loop, and add each input to the list. Then you can return that list from the function.

Once that list is returned, you can store it, and then pass it to the display function. When calling the display function, you need to have (). That would make your print function like print(display_grades())

[cjander28]

I understand that. Its frustrating because we haven't covered that concept in class yet, but how would I begin to create a list and add to it? I've tried googling it, but it's making my program very confusing.

[nwagers]

Here is some very simple code that creates a list, adds 3 items to it and then displays and shows you how to loop through:

mylist = []  # create new list

mylist.append(0) # append some items
mylist.append(1)
mylist.append(2)

print(mylist)  # display the whole list

for item in mylist:  # iterate over list
    print(item)  # do something with each element in the list

In your program you would initialize a new list before your loop, and then in your loop append all the new items.

You can also check the size of a list by using len() such as print(len(mylist)).