On Fri, Aug 22, 2014 at 10:26 AM, luofeiyu <elearn2...@gmail.com> wrote:
> System:win7+python34.
>
> class Contact(object):
> def __init__(self, first_name=None, last_name=None,
> display_name=None, email=None):
> self.first_name = first_name
> self.last_name = last_name
> self.display_name = display_name
> self.email = email
> def print_info(self):
> print(self.display_name, "<" + self.email + ">" )
> def set_email(self, value):
> if '@' not in value:
> raise Exception("This doesn't look like an email address.")
> self._email = value
> def get_email(self):
> return self._email
> email = property(get_email, set_email)
>
> contact = Contact()
>
> The error message is :
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "<stdin>", line 7, in __init__
> File "<stdin>", line 11, in set_email
> TypeError: argument of type 'NoneType' is not iterable
>
> What is wrong with the code?
The 'in' operator requires an iterable. When you do 'self.email =
email' set_email gets called and value is None.
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