TypeError: cannot unpack non-iterable NoneType object in Python

Dung Do Tien Aug 20 2022 374

Hi everyone. 

I have a question that needs anyone's helps to solve. I wrote a small Python application and I have a list of integers and want to average and find the max number of that array.   Here is my code:

purchases = [30, 39, 480, 700, 760, 740, 800]

def calculate_statistics(purchases):
        average_purchase = sum(purchases) / len(purchases)
        largest_purchase = max(purchases)
        
average, largest = calculate_statistics(purchases)
print("The average purchase was ${}.".format(round(average, 2)))
print("The largest purchase was ${}.".format(round(largest, 2)))

But when ran this code I got an exception TypeError: cannot unpack non-iterable NoneType object. Here is detail of the exception:

Traceback (most recent call last):
  File "main.py", line 7, in <module>
    average, largest = calculate_statistics(purchases)
TypeError: cannot unpack non-iterable NoneType object


** Process exited - Return Code: 1 **
Press Enter to exit terminal

I installed Python 3.10

Anyone can explain and help me? 

Thanks in advance.

Have 1 answer(s) found.
  • U

    Uad Dir Aug 20 2022

    You can see the calculate_statistics function, you’ve forgotten a return statement:

    purchases = [30, 39, 480, 700, 760, 740, 800]

def calculate_statistics(purchases):
        average_purchase = sum(purchases) / len(purchases)
        largest_purchase = max(purchases)
        return average_purchase, largest_purchase 'Need to return here

average, largest = calculate_statistics(purchases)
print("The average purchase was ${}.".format(round(average, 2)))
print("The largest purchase was ${}.".format(round(largest, 2)))

    #Output

    The average purchase was $507.0.
The largest purchase was $800.


** Process exited - Return Code: 0 **
Press Enter to exit terminal

    Hope this is useful for you.

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