Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

Python
1

Tell us what’s happening:

I did this project in vscode and it runs perfectly, same in the website, the results are correct. but still I couldn’t pass any test, Not even one.
I tried changing some things I thought are causing this like deleting the last 4 spaces from the problems result, yet again still failed all of them and I don’t know why?

Your code so far

#Build an Arithmetic Formatter Project 

def validate(string):
    for char in string:
        find_input = '0123456789 -+*/'
        index = find_input.find(char)

        #checking for non-digit characters and false operations
        if index == -1:
            print('Error: Numbers must only contain digits.')
            return 'Invalid'
        
        elif index > 12:
            #double quotes are preffered because you cant use same quotes inside 
            print("Error: Operator must be '+' or '-'.")
            return 'Invalid'
        
        elif index == 10:
            space_index = string.find(char)
            reversed_string = string[::-1].find(char)

            #accepting 4 digit numbers atmost (max)
            if space_index > 4:
                print('Error: Numbers cannot be more than four digits.')
                return 'Invalid'
            elif reversed_string > 4:
                print('Error: Numbers cannot be more than four digits.')
                return 'Invalid'

     
               
def insert_string(string, insert, i = 0, new_string = ''):
    #adding a space and dash using iteration according to the lenght of the string
    while i > 0:
        new_string += insert
        i -= 1

    new_string += f'{string}    '
    return new_string 


def calculate(top_number, bottom_number, operator):

    first_number = int(top_number)
    second_number = int(bottom_number)

    if operator == '+':
        result = first_number + second_number
        return f'{result}'
    elif operator == '-':
        result = first_number - second_number
        return f'{result}'


def arithmetic_arranger(problems, show_answers=False):
    #string containers to escape the for loop and collect every return value
    top_row = ''
    bottom_row = '\n'
    dash_row = '\n'
    answers_row = '\n' 
    #declining more than five problems
    if len(problems) > 5:
        print('Error: Too many problems.')
        return
    else: 
        for problem in problems:
            #removing white space and signs at the start and end
            string = problem.strip(' +-')
            #validation test:
            if validate(string) == 'Invalid':
                return
            else:
                #separating the two operands and getting the operator
                space_index = string.find(' ')
                operator = string[space_index + 1]
                top_number = string[:space_index:]
                bottom_number = string[space_index + 1::].strip(' +-')
                #calculating the answer...
                answer = calculate(top_number, bottom_number, operator)
                #formatting the problem display
                long_num_space = 2
                sign_space = 1

                if len(top_number) > len(bottom_number):
                    dash_num = len(top_number) + long_num_space
                    short_num_space = dash_num - (len(bottom_number) + sign_space)
                    top_row += insert_string(top_number, ' ', long_num_space)
                    bottom_row += insert_string(bottom_number, ' ', short_num_space, operator)
                    dash_row += insert_string('', '-', dash_num)
                    answers_row += insert_string(answer, ' ', dash_num - len(answer))

                elif len(top_number) == len(bottom_number):
                    dash_num = len(top_number) + long_num_space
                    top_row += insert_string(top_number, ' ', long_num_space)
                    bottom_row += insert_string(bottom_number, ' ', sign_space, operator)
                    dash_row += insert_string('', '-', dash_num)
                    if answer[0] != '-':
                        answers_row += insert_string(answer, ' ', dash_num - len(answer))
                    else:
                        answers_row += insert_string(answer[1::], ' ', dash_num - len(answer), answer[0])

                elif len(top_number) < len(bottom_number):
                    dash_num = len(bottom_number) + long_num_space
                    short_num_space = dash_num - len(top_number)
                    top_row += insert_string(top_number, ' ', short_num_space)
                    bottom_row += insert_string(bottom_number, ' ', sign_space, operator)
                    dash_row += insert_string('', '-', dash_num)
                    if answer[0] != '-':
                        answers_row += insert_string(answer, ' ', dash_num - len(answer))
                    else:
                        answers_row += insert_string(answer[1::], ' ', dash_num - len(answer), answer[0])

        #assigning the containers strings to problems and deleting added space at the end
        problems = top_row[:-4:] + bottom_row[:-4:] + dash_row[:-4:]

        #displaying answers when the default value of the parameter is True.
        if show_answers == True:
            problems += answers_row[:-4:]   

        return print(problems)
    
arithmetic_arranger(["3801 - 2", "123 + 49", "11 - 44"])```
```py

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Challenge Information:

Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

2

I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

Pre-formatted-text
Pre-formatted-text1356×380 401 KB

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').

3

I was trying to test your function with
print("output is:", repr(arithmetic_arranger(["3801 - 2", "123 + 49"])))

but all I see printed is output is: None

you maybe need to adjust that so that your function is actually returning a string

1 Like
4

so you mean i should not print inside the function but return a string to print outside