Hi Kent, > Hans Fangohr wrote: > >> In [2]: 2 in [1,2,3] == True >> Out[2]: False >> >> Why does [2] return False? Would people agree that this is a bug? > > No, not a bug. Don't be too quick to blame your tools!
That's good news. I'd be worried if this wasn't the desired behaviour -- I just hadn't understood the logic. > > The equivalent expression is > In [1]: (2 in [1,2,3]) and ([1,2,3]==False) > Out[1]: False Ah -- that's the way to read it! > > 'in' is considered a comparison operator and can be chained with other > comparisons. For a clearer example, consider > In [2]: 2 < 3 < 4 > Out[2]: True > > which is not the same as > In [3]: 2 < (3 < 4) > Out[3]: False > > or > In [4]: (2 < 3) < 4 > Out[4]: True > > It is equivalent to > In [5]: (2 < 3) and (3 < 4) > Out[5]: True > Well explained -- makes perfect sense now. Many thanks, Hans > See > http://docs.python.org/ref/comparisons.html > > Kent > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > > > -- Hans Fangohr School of Engineering Sciences University of Southampton Phone: +44 (0) 238059 8345 Email: [EMAIL PROTECTED] http://www.soton.ac.uk/~fangohr _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
