Python iterator tests

dateFileSystemIterator.py

"""
Copyright 2016 Ekaitz Zarraga <ekaitzzarraga@gmail.com>
This work is free. You can redistribute it and/or modify it under the
terms of the Do What The Fuck You Want To Public License, Version
as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
"""

from datetime import timedelta
from datetime import date

class dateFileSystemIterator:

    """
    Stupid but nice class to iterate over YYYY/MM/DD filesystems or similar.
    """
    def __init__( self, start = date.today(), end = date.today(), days_step = 1, separator = '/'):
        self.start = start
        self.current = start
        self.end = end
        self.separator = separator
        self.step = timedelta( days = days_step )

    def __iter__( self ):
        return self

    def __next__( self ): # Python3 compatibility
        return self.next()

    def next( self ):
        if self.current >= self.end:
            raise StopIteration
        else:
            self.current += self.step
            datestring = self.current - self.step
            datestring = datestring.strftime("%Y"+self.separator+"%m"+self.separator+"%d")
            return datestring

    def __str__( self ):
        out = self.current - self.step
        tostring = lambda x: x.strftime("%Y"+self.separator+"%m"+self.separator+"%d")
        return "<dateFileSystemIterator: <Current: " + tostring(self.current) + ">" \
                + ",<Start: " + tostring(self.start)  + ">" \
                + ",<End: " + tostring(self.end)  + ">" \
                + ",<Step: " + str(self.step) +  ">"

    def __repr__( self ):
        return self.__str__()

if __name__ == '__main__':
    it=dateFileSystemIterator(start = date.today() - timedelta(days=30))
    print it
    for i in it:
        print i

dateFileSystemIteratorYield.py

"""
Copyright 2016 Ekaitz Zarraga <ekaitzzarraga@gmail.com>
This work is free. You can redistribute it and/or modify it under the
terms of the Do What The Fuck You Want To Public License, Version
as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
"""

"""
Yield style version. Similar but shorter
"""

from datetime import datetime, timedelta

def iterate_dates( date_start, date_end=datetime.today(), separator='/'):
    date = date_start
    while date < date_end:
        yield date.strftime('%Y'+separator+'%m'+separator+'%d')
        date += timedelta(days=1)

if __name__ == '__main__':
    for a in iterate_dates( datetime.today() - timedelta(days=10) ):
        print a