gistfile1.py

import os


def walk(root, startTimestamp, stopTimestamp):
    """
    Walk the filesystem, descending from C{root}, yielding the paths of
    files with modification dates more recent than C{startTimestamp} and at
    most as recent as C{stopTimestamp}.

    The aim is that our caller should be able to use the value of
    C{stopTimestamp} from a call to us as the value of C{startTimestamp}
    in a subsequent call, without missing any modified files.

    @param root: The C{str} root of the filesystem to start at.
    @param startTimestamp: The C{float} timestamp that files must be
        newer than.
    @param stopTimestamp: The C{float} timestamp that files cannot be
        newer than.
    @return: A generator yielding full file paths.

    """
    for dirpath, dirnames, filenames in os.walk(root):
        for name in filenames:
            path = os.path.join(dirpath, name)
            status = os.stat(path)
            if startTimestamp < status.st_mtime <= stopTimestamp:
                yield path