Not sure why the test module prints "none"

Hi All,

Would appreciate if any one could point out to me why the test modules print out “None” causing my code to fail the tests however when main.py is ran, the output seems correct.

Attached is my code

def create_spend_chart(categories):
    
    # calculate expenses in each category
    category_spend = []

    for i in range (len(categories)):
        spend_in_ledger = []
        for j in range (len(categories[i].ledger)):
            if categories[i].ledger[j]["amount"]<0:
                spend_in_ledger.append(categories[i].ledger[j]["amount"])
        total_spend_in_ledger = sum(spend_in_ledger)
        category_spend.append(total_spend_in_ledger)
    
    # calculate total expenses
    total_spend = sum(category_spend)
    
    # calculate % expenditure
    category_percent = []
    for i in range (len(category_spend)):
        percent = (int(category_spend[i]/total_spend*10))*10
        category_percent.append(percent)
    
    # print out chart
    print ("Percentage spent by category")

    # generating a line on the chart
    chart_line = []
    yaxis = [x for x in range (100,-1,-10)]
    for i in range (len(yaxis)):
        chart = []
        for j in range (len(category_percent)):
            if yaxis[i] > category_percent[j]:
                chart.append("   ")
            else:
                chart.append("o  ")
        chart_line.append("".join(chart))   
    
    # putting to gether the chart display
    chart_display = ""
    for i in range (len(yaxis)):
        chart_display += f"{yaxis[i]:>3}" + "|" + " " + chart_line[i] + '\n'
    chart_display = chart_display + "    -" + ("---"*len(categories))
    print (chart_display)

    # printing xaxis category
    cat_length = 0
    cat_name = []
    xaxis = ""
    for i in range (len(categories)):
        cat_name.append(list(categories[i].CategoryName))
        if len(categories[i].CategoryName)> cat_length:
            cat_length = len(categories[i].CategoryName)
        
    for x in range(cat_length):
        nameStr = "     "
        for i in range(len(cat_name)):
            if x >= len(cat_name[i]):
                nameStr += "   "
            else:
                nameStr += cat_name[i][x] + "  "
        nameStr += '\n'
        xaxis += nameStr
    print (xaxis)

Attached is the test code

def test_create_spend_chart(self):
        self.food.deposit(900, "deposit")
        self.entertainment.deposit(900, "deposit")
        self.business.deposit(900, "deposit")
        self.food.withdraw(105.55)
        self.entertainment.withdraw(33.40)
        self.business.withdraw(10.99)
        actual = create_spend_chart([self.business, self.food, self.entertainment])
        expected = "Percentage spent by category\n100|          \n 90|          \n 80|          \n 70|    o     \n 60|    o     \n 50|    o     \n 40|    o     \n 30|    o     \n 20|    o  o  \n 10|    o  o  \n  0| o  o  o  \n    ----------\n     B  F  E  \n     u  o  n  \n     s  o  t  \n     i  d  e  \n     n     r  \n     e     t  \n     s     a  \n     s     i  \n           n  \n           m  \n           e  \n           n  \n           t  "
        self.assertEqual(actual, expected, 'Expected different chart representation. Check that all spacing is exact.')

Attached is the print screen of what is printed.

your function doesn’t return a value so it returns None

you need it to return a value

Hi Ieahleen,

Thanks so much…I can’t believe I didn’t realize that. Must have been using print too often to check my output.

Thanks again!