little class to manage my filename needs to manage data-files that start with a timestr. Pretty handy to have something like this

file_utils.py

import os
from datetime import datetime as dt


class FileName(object):
    """Managing class for file name attributes """
    def __init__(self, fname):
        super(FileName, self).__init__()
        self.basename = os.path.basename(fname)
        self.dirname = os.path.dirname(fname)
        self.timestr= self.basename.split('_')[0]
        # save everything after the first '_' as rest
        self.rest = self.basename[self.basename.find('_'):]
        # split of the time elements
        self.year = self.timestr[:4]
        self.month = self.timestr[4:6]
        self.day = self.timestr[6:8]
        # if timestr is not long enough, self.hour will be empty string ''
        self.hour = self.timestr[8:10]
        # set time member
        self.set_time()
    
    def set_time(self):
        if len(self.timestr) == 8:
            format = '%Y%m%d'
        elif len(self.timestr) == 10:
            format = "%Y%m%d%H"
        else:
            format = '%Y%m%d%H%M'
        self.time = dt.strptime(self.timestr, format)
        self.format = format
    
    def get_previous_hour(self):
        return self.time - timedelta(hours=1)
        
    def set_previous_hour(self):
        newtime = self.get_previous_hour()
        self.time = newtime
        self.timestr = newtime.strftime(self.format)
        return self.fname
        
    def get_next_hour(self):
        return self.time + timedelta(hours=1)
        
    def set_next_hour(self):
        newtime = self.get_next_hour()
        self.time = newtime
        self.timestr = newtime.strftime(self.format)
        return self.fname
        
    @property
    def fname(self):
        return os.path.join(self.dirname, self.timestr + self.rest)