I completed this challenge and my output is exactly as required, but when I run the tests it gives the message “tests completed” but each test shows an X besides it and I’m not able to mark this challenge as completed.

Your code so far

def arithmetic_arranger(problems, show_answers=False):
output = {'line1':'', 'line2':'', 'line3': '', 'line4': ''}
if len(problems) > 5:
return print('Error: Too many problems.')
for problem in problems:
if '+' in problem:
operator = problem[problem.index('+')]
elif '-' in problem:
operator = problem[problem.index('-')]
else:
return print('"Error: Operator must be \'+\' or \'-\'."')
operand1 = problem[:problem.index(operator)].strip()
operand2 = problem[problem.index(operator) + 1:].strip()
if not operand1.isnumeric() or not operand2.isnumeric():
return print('Error: Numbers must only contain digits.')
if len(operand1) > 4 or len(operand2) > 4:
return print('Error: Numbers cannot be more than four digits.')
length1 = len(operand1)
length2 = len(operand2)
if length1 > length2:
longest = length1
else:
longest = length2
if operator == '+':
answer = int(operand1) + int(operand2)
else:
answer = int(operand1) - int(operand2)
line1 = operand1.rjust(longest + 2) #line 1
line2 = operator + ' ' + operand2.rjust(longest) #line 2
line3 = '-' * (longest + 2) #line 3
line4 = str(answer).rjust(longest + 2) #line 4
output['line1'] += line1 + ' ' * 4
output['line2'] += line2 + ' ' * 4
output['line3'] += line3 + ' ' * 4
output['line4'] += line4 + ' ' * 4
print(output['line1'])
print(output['line2'])
print(output['line3'])
if show_answers: print(output['line4'])
arithmetic_arranger(["3801 - 2", "123 + 49"])

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Challenge Information:

Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

Thanks for replying, Now I explicitly stripped off all whitespace at the end of each line but it’s still not passing the tests even though the output is exactly what’s required.

def arithmetic_arranger(problems, show_answers=False):
output = {'line1':'', 'line2':'', 'line3': '', 'line4': ''}
if len(problems) > 5:
return print('Error: Too many problems.')
for problem in problems:
if '+' in problem:
operator = problem[problem.index('+')]
elif '-' in problem:
operator = problem[problem.index('-')]
else:
return print('"Error: Operator must be \'+\' or \'-\'."')
operand1 = problem[:problem.index(operator)].strip()
operand2 = problem[problem.index(operator) + 1:].strip()
if not operand1.isnumeric() or not operand2.isnumeric():
return print('Error: Numbers must only contain digits.')
if len(operand1) > 4 or len(operand2) > 4:
return print('Error: Numbers cannot be more than four digits.')
length1 = len(operand1)
length2 = len(operand2)
if length1 > length2:
longest = length1
else:
longest = length2
if operator == '+':
answer = int(operand1) + int(operand2)
else:
answer = int(operand1) - int(operand2)
line1 = operand1.rjust(longest + 2) + ' ' * 4 #line 1
line2 = operator + ' ' + operand2.rjust(longest) + ' ' * 4 #line 2
line3 = '-' * (longest + 2) + ' ' * 4 #line 3
line4 = str(answer).rjust(longest + 2) #line 4
output['line1'] += line1
output['line2'] += line2
output['line3'] += line3
output['line4'] += line4
output['line1'].strip()
output['line2'].strip()
output['line3'].strip()
output['line4'].strip()
if show_answers:
print(
output['line1'] + '\n' + output['line2'] + '\n' + output['line3'] + '\n' + output['line4']
)
else:
print(
output['line1']+'\n'+output['line2']+'\n'+output['line3']
)
arithmetic_arranger(["3801 - 2", "123 + 49"])

Hi. got the same problem as you, fixed it by doing this:

removed

our problem sits on the fact that we have an empty space (4 spaces after each problem) on the end of each formatted problem. the test wants us to add the spaces at the start of the formatted problem.

what i did was removing all spaces on the end of the first problem (index == 0) and adding a space at the start of the other problems. kinda hard to explain it here. but feel free to ask

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.

We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.

Note that the first argument is YOUR answer, which results in 100 chars, whereas the test wants you to get 84 chars. Take note of the 4 block space between the problems, the assertion error is caused because of the 4 spaces are put at the end of the problem. You should put them at the start.

This is interesting, now I added the spaces before the operands and the output seems to be what’s expected, but now the console is showing this error:

python-test-evaluator.ts:177 PythonError: Traceback (most recent call last):
File “/lib/python311.zip/_pyodide/_base.py”, line 468, in eval_code
.run(globals, locals)
^^^^^^^^^^^^^^^^^^^^
File “/lib/python311.zip/_pyodide/_base.py”, line 310, in run
coroutine = eval(self.code, globals, locals)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “”, line 4, in
File “/lib/python311.zip/unittest/case.py”, line 873, in assertEqual
assertion_func(first, second, msg=msg)
File “/lib/python311.zip/unittest/case.py”, line 866, in _baseAssertEqual
raise self.failureException(msg)
AssertionError: None != ’ 3801 123\n- 2 + 49\n------ -----’

And here is my code:
def arithmetic_arranger(problems, show_answers=False):
output = {‘line1’:‘’, ‘line2’:‘’, ‘line3’: ‘’, ‘line4’: ‘’}
if len(problems) > 5:
return print(‘Error: Too many problems.’)
index = 0
for problem in problems:
if index > 0:
seperator_spaces = ’ ’ # four spaces here
else:
seperator_spaces = ‘’ # zero spaces here

if '+' in problem:
operator = problem[problem.index('+')]
elif '-' in problem:
operator = problem[problem.index('-')]
else:
return print('"Error: Operator must be \'+\' or \'-\'."')
operand1 = problem[:problem.index(operator)].strip()
operand2 = problem[problem.index(operator) + 1:].strip()
if not operand1.isnumeric() or not operand2.isnumeric():
return print('Error: Numbers must only contain digits.')
if len(operand1) > 4 or len(operand2) > 4:
return print('Error: Numbers cannot be more than four digits.')
length1 = len(operand1)
length2 = len(operand2)
if length1 > length2:
longest = length1
else:
longest = length2
if operator == '+':
answer = int(operand1) + int(operand2)
else:
answer = int(operand1) - int(operand2)
line1 = seperator_spaces + operand1.rjust(longest + 2) #line 1
line2 = seperator_spaces + operator + ' ' + operand2.rjust(longest) #line 2
line3 = seperator_spaces + '-' * (longest + 2) #line 3
line4 = seperator_spaces + str(answer).rjust(longest + 2) #line 4
output['line1'] += line1
output['line2'] += line2
output['line3'] += line3
output['line4'] += line4
index += 1
print(output['line1'])
print(output['line2'])
print(output['line3'])
if show_answers: print(output['line4'])

Hi @gtrrich, I was in a similar situation as you and couldn’t figure out why my code passed all the tests but was giving X’s for every one.
I got it to pass. Turns out the challenge is asking for code that returns results and error codes, but does not print anything.
Hope this helps. I’m new to programming and this point was very confusing.