Where is the NoneType located in Python 3.x?

Question

In Python 3, I would like to check whether value is either string or None.

One way to do this is

assert type(value) in { st         


        

Answer 1

Please use type(None). You can use python shell to check like in the below function in which I use type(None) in order to change from None to NoneType.

def to_unicode(value):
'''change value to unicode'''
try:
    if isinstance(value, (str,type(None))):
        return value
    if not isinstance(value, bytes):
        raise TypeError("Expected bytes, unicode, or None; got %r" % type(value))
    return value.decode("utf-8")
except UnicodeDecodeError:
    return repr(value)