What is a 'NoneType' object?

Question

I\'m getting this error when I run my python script:

TypeError: cannot concatenate \'str\' and \'NoneType\' objects

I\'m pretty sure the \'

Answer 1

NoneType is simply the type of the None singleton:

>>> type(None)

From the latter link above:

None

The sole value of the type NoneType. None is frequently used to represent the absence of a value, as when default arguments are not passed to a function. Assignments to None are illegal and raise a SyntaxError.

In your case, it looks like one of the items you are trying to concatenate is None, hence your error.