culpritNr1 wrote in news:mailman.7713.1232574803.3487.python-l...@python.org in comp.lang.python:
> > Hello All, > > Say I have a list like this: > > a = [0 , 1, 3.14, 20, 8, 8, 3.14] > > Is there a simple python way to count the number of 3.14's in the list > in one statement? > > In R I do like this > > a = c(0 , 1, 3.14, 20, 8, 8, 3.14) > > length( a[ a[]==3.14 ] ) > > How do I do that in standard python? count = a.count( 3.14 ) > > (Note that this is just an example, I do not mean to use == in > floating point operations.) In this case something like this: a = [0 , 1, 3.14, 20, 8, 8, 3.14] count = sum( 1 for x in a if 3.13 < x and x < 3.15 ) http://docs.python.org/library/functions.html#sum http://docs.python.org/reference/expressions.html#generator-expressions Rob. -- http://www.victim-prime.dsl.pipex.com/ -- http://mail.python.org/mailman/listinfo/python-list
