Terry Reedy writes: > On 2/12/2010 4:40 AM, Jussi Piitulainen wrote: > > Terry Reedy writes: > >> On 2/11/2010 11:23 AM, Jussi Piitulainen wrote: > >>> Robert Kern writes: > >>>> On 2010-02-11 06:31 AM, Shashwat Anand wrote: > >>>>> There is a little issue here that '>>> -.1 ** .1' should give you > >>>>> error message. That is it. > >>>> > >>>> No, fractional powers of negative numbers are perfectly valid > >>>> mathematically. The result is a complex number. In Python 3 (what > >>>> the OP is using), this has been implemented, but not in Python 2.6. > >>> > >>> Perhaps it should raise a MisleadingSpacingError at compile time. > >> > >> You forgot the smiley ;-). > >> > >> > The error message could recommend - .1**.1, or better -(.1 ** .1). > >> > >> The compiler would never see the difference between -.1 ** .1 and the > >> first and probably no difference with the second either. > > > > It could be done the same way that the compiler keeps track of the > > source line numbers now: early phases annotate their output with any > > information that later phases may need. This error would be detected > > during syntactic analysis. > > There is no error to detect. Sorry, read the manual and either learn > or lookup precedence rules (there is a table in the end of the > Expressions chapter) or use parentheses when not sure.
Thanks. -- http://mail.python.org/mailman/listinfo/python-list
