Joe Leonardo wrote:
Totally baffled by this…maybe I need a nap. Writing a small function to
reject input that is not a list of 19 fields.
def breakLine(value):
if value.__class__() != [] and value.__len__() != 19:
print 'You must pass a list that contains 19 fields.'
else:
print 'YAY!'
If I pass:
breakLine([])
I get:
YAY!
Change your 'and' to an 'or'.
Also, change your 'value.__len__()' to 'len(value)'.
Finally, if you absolutely don't want any iterable that might work (such
as a tuple), change 'value.__class__() != []' to either 'type(value) !=
list' or, if subclasses are okay (and they probably should be) 'not
isinstance(value, list)'.
Incorporating these suggestions looks like this:
def breakLine(value):
if not isinstance(value, list) or len(value) != 19:
print 'You must pass a list that contains 19 fields.'
else:
print 'YAY!'
--
http://mail.python.org/mailman/listinfo/python-list
