On Thu, 12 Aug 2010 13:28:26 -0700, David Niergarth wrote: > Peter Otten <__pete...@web.de> wrote: >> >> >>> 1 .conjugate() >> >> > This is a syntax I never noticed before. My built-in complier (eyes) > took one look and said: "that doesn't work." Has this always worked in > Python but I never noticed?
Yes. Here is is working in Python 2.2: [st...@sylar ~]$ python2.2 Python 2.2.3 (#1, Aug 12 2010, 01:08:27) [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> 2 .__add__(3) 5 Syntactically, it also worked as far back as Python 1.5, although it is rather pointless since int objects didn't gain any methods until 2.2: [st...@sylar ~]$ python1.5 Python 1.5.2 (#1, Apr 1 2009, 22:55:54) [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> 2 .__add__(3) Traceback (innermost last): File "<stdin>", line 1, in ? AttributeError: 'int' object has no attribute '__add__' > I see other instance examples also work. > > >>> '1' .zfill(2) > '01' You don't need the space between strings and the attribute access: "1".zfill(2) is fine. You only need it for numbers, due to the ambiguity between the decimal point and dotted attribute access. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
