In Python, TypeError is subclass that Exception. Python sequence deserve to be unpacked. This means you have the right to assign content of sequence to lot of variables. If you shot to assign a None worth to a variable by making use of this syntax then it throws error together “TypeError: deserve to not unpack Non-iterable None form object”.
You are watching: Typeerror: cannot unpack non-iterable nonetype object
Note:Syntax error need to not be handle through exception dealing with it have to be addressed in her code.BaseExceptionException
You can inspect complete perform ofbuilt-in exemption hierarchyby complying with link.Python: built-in Exceptions Hierarchy
How to unpack sequence aspects to variables?
In this below unpacking succession the facets of list will certainly assign to variables in sequence. For example:
In the over code the worths in fruit_prices will certainly assign in variables as below :
grapes=250, bananas=80, apples=200
Lets take one more example of unpacking sequence from duty where return worths from features can be assigned in sequence of variables. Because that Example:
prices = <4.30, 5.90, 6.70, 3.90, 5.60, 8.30, 6.50>def calculate_statistics(prices): average_price = sum(prices) / len(prices) largest_price = max(prices) return average_price, largest_priceaverage, biggest = calculate_statistics(prices)print("Average :"+str(average))print("Largest :"+str(largest))
In this above example, If friend will see it’s returning 2 values (line 5) indigenous calculate_statistics duty and returned values will assign come variables average and also largest in sequence (line 6).
Average : 5.88
Largest : 8.30
Scenario because that Exception
Now lets produce scenario for creating exception, I have modified the over code through comments the heat # 5. It will screen the code as below
prices = <4.30, 5.90, 6.70, 3.90, 5.60, 8.30, 6.50>def calculate_statistics(prices): average_price = sum(prices) / len(prices) largest_price = max(prices) #return average_price, largest_priceaverage, largest = calculate_statistics(prices)print("Average :"+str(average))print("Largest :"+str(largest))
When girlfriend execute the above code will certainly through exemption as below
average, largest = calculate_statistics(prices)
TypeError: ‘NoneType’ object is not iterable
In this example, expect you know the scenario together the number of values in sequence will certainly assigned to value on same variety of value.
Learn Python exception handling in an ext detain in topicPython: exception Handling
NoneTypereturn multiple values from functionSequence assign to variableTypeErrorUnpack No-iterable Nonetype objectPost navigation
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