LaundroMat wrote: [me hitting send too soon]
> Now, if I look at this script step by step, I don't understand: > - where the "while 1:"-loop is quitted. > class DirectoryWalker: > # a forward iterator that traverses a directory tree > > def __init__(self, directory): > self.stack = [directory] > self.files = [] > self.index = 0 > > def __getitem__(self, index): > while 1: > try: > file = self.files[self.index] > self.index = self.index + 1 > except IndexError: > # pop next directory from stack > self.directory = self.stack.pop() If self.stack is empty, pop() will raise an IndexError which terminates both the 'while 1' loop in __getitem__() and the enclosing 'for file in ...' loop > self.files = os.listdir(self.directory) > self.index = 0 > else: > # got a filename > fullname = os.path.join(self.directory, file) > if os.path.isdir(fullname) and not > os.path.islink(fullname): > self.stack.append(fullname) > return fullname The return statement feeds the next file to the for loop. Peter -- http://mail.python.org/mailman/listinfo/python-list
