jmDesktop schrieb: > On Apr 9, 4:58 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: >> jmDesktop schrieb: >> >> >> >> >> >>> From the Python.org tutorial: >>>>>> for n in range(2, 10): >>> ... for x in range(2, n): >>> ... if n % x == 0: >>> ... print n, 'equals', x, '*', n/x >>> ... break >>> ... else: >>> ... # loop fell through without finding a factor >>> ... print n, 'is a prime number' >>> ... >>> 2 is a prime number >>> 3 is a prime number >>> 4 equals 2 * 2 >>> 5 is a prime number >>> 6 equals 2 * 3 >>> 7 is a prime number >>> 8 equals 2 * 4 >>> 9 equals 3 * 3 >>> first time 2 mod 2, 2/2, no remainder == 0, what am I doing wrong? >>> Why did it fall through? >> print out what range(2, n) for n == 2 is. >> >> And if you didn't know - 2 *IS* a prime. >> >> Diez- Hide quoted text - >> >> - Show quoted text - > > I do not understand.
for <variable> in <sequence> loops over a sequence. And of course it doens't if the sequence is empty, because you can't loop over something that is empty, can't you? and range(2,2) is the empty sequence. Diez -- http://mail.python.org/mailman/listinfo/python-list
