Scientific Computing with Python Projects - Budget App - can't figure spend chart assertion error

[luisdamed]

Tell us what’s happening:
I’m having a problem with the assertion for the create_spend_chart method.
The console is showing me the following and I can’t figure out what is wrong.

======================================================================
FAIL: test_create_spend_chart (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/Budget-app/test_module.py", line 94, in test_create_spend_chart
    self.assertEqual(actual, expected, 'Expected different chart representation. Check that all spacing is exact.')
AssertionError: 'Perc[21 chars]ory\n\n100|          \n 90|          \n 80|   [357 chars]  \n' != 'Perc[21 chars]ory\n100|          \n 90|          \n 80|     [353 chars] t  '
  Percentage spent by category
- 
  100|          
   90|          
   80|          
   70|    o     
   60|    o     
   50|    o     
   40|    o     
   30|    o     
   20|    o  o  
-  10| o  o  o  
?            ---
+  10|    o  o  
?      +++
    0| o  o  o  
      ----------
       B  F  E  
       u  o  n  
       s  o  t  
       i  d  e  
       n     r  
       e     t  
       s     a  
       s     i  
             n  
             m  
             e  
             n  
-            t  
?               -
+            t   : Expected different chart representation. Check that all spacing is exact.

Here is my code so far
I created a helper method to get the expenses from the list of categories. Then I convert those values into percentages rounded to the nearest 10.

Next, I create the chart using a long for loop. I know, there are better ways to do this, but hey, this should work, right?

def getExpenses(categories):
    total = 0
    withdrawals = []
    for entry in categories:
        total += entry.findWithdrawn()
        withdrawals.append(entry.findWithdrawn())
    return withdrawals


def create_spend_chart(categories):
    res = "Percentage spent by category\n"
    totals = getExpenses(categories)
    percentages = [int(round(el / sum(totals) * 100, -1)) for el in totals]

    max_len = max([len(el.Category) for el in categories])
    bar = True

    for level in range(100, -10 - 10 * max_len, -10):
        if level >= 0:
            res += f'\n{level:>3}| '
            for pct_category in percentages:
                if pct_category >= level:
                    res += 'o  '
                else:
                    res += '   '
        if level < 0:
            if bar:
                res += '\n    -'
                for category in categories:
                    res += '---'
                bar = False
                res += '\n'
            res += '     '
            ind = int((-level - 10) / 10)
            for entry in categories:
                if ind < len(entry.Category):
                    res += entry.Category[ind] + '  '
                else:
                    res += '   '
            res += '\n'
    return res

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Challenge: Scientific Computing with Python Projects - Budget App

Link to the challenge:

freeCodeCamp.org

I’d really appreciate any feedback.
I’ve been scratching my head today for a couple hours, and I’ve been coming back to this particular challenge, not being able to complete it. For sure there is something I’m missing and I need an extra pair of eyes or an external opinion maybe.

I hesitated to post a question here, but I’ve already searched and tried as much as I could, and I thought it’s better to ask for help rather than abandoning it.

[luisdamed]

Ok, I’ve figured it out. I was doing a couple of silly things and wasn’t looking at the problem clearly.

What helped me realize the errors was the assertion message:

AssertionError: 'Perc[21 chars]ory\n\n100|          \n 90|          \n 80|   [357 chars]  \n' != 'Perc[21 chars]ory\n100|          \n 90|          \n 80|     [353 chars] t  '

1. There where two \n after the title of the chart. I was adding the new line on the creation of the string and then as part of my loop.
2. I was doing a similar thing with the \n characters at the end of the axis labels. The expected solution doesn’t have a new line at the end, it ends with ... t ' (a space)
3. I was rounding out my percentages using
   percentages = [int(round(el / sum(totals) * 100, -1)) for el in totals]
   This messed up with the heights of the bars. I removed the rounding and int casting and not it works fine!

So I passed this test!