Guido van Rossum <guido@python.org>: > > > def __str__(self): > > > pass > > > > Dunno about other people's opinions, but I have a strong distaste for > > creating methods whose body contains pass. I always use "raise > > NotImplementedError". > > But that has different semantics! In this particular case, the program blows up anyway if this method is ever called, so you might as well return a meaningful exception! Python 2.2 (#14, May 28 2002, 14:11:27) [GCC 2.95.2 19991024 (release)] on sunos5 Type "help", "copyright", "credits" or "license" for more information. >>> class C: ... def __str__(self): ... pass ... >>> c = C() >>> str(c) Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: __str__ returned non-string (type NoneType) >>> Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg@cosc.canterbury.ac.nz +--------------------------------------+
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