On Oct 29, 5:57 pm, GHZ <[EMAIL PROTECTED]> wrote: > Is this the best way to test every item in a list?
No. The biggest problem is, obviously, you don't take advantage of builtins any() and all(), or write corresponding short-circuiting versions for python versions before 2.5. The second problem is you build an entire list that gets disposed of just as quickly. The third problem is you use lambda, which makes your call to map() time inefficient as well as space inefficient. Both of these problems can be fixed by using generator expressions. > def alltrue(f,l): > return reduce(bool.__and__,map(f,l)) > > def onetrue(f,l): > return reduce(bool.__or__,map(f,l)) > > > > >>> alltrue(lambda x:x>1,[1,2,3]) > False >>> all(x>1 for x in [1,2,3]) False > >>> alltrue(lambda x:x>=1,[1,2,3]) > True >>> all(x>=1 for x in [1,2,3]) True > Thanks HTH -- http://mail.python.org/mailman/listinfo/python-list
