python logging: how to ensure logfile directory is created?

Subclass FileHandler (or whatever handler you are using) to call mkdir_p during initialization:

import logging
import os
import errno

def mkdir_p(path):
    """http://stackoverflow.com/a/600612/190597 (tzot)"""
    try:
        os.makedirs(path, exist_ok=True)  # Python>3.2
    except TypeError:
        try:
            os.makedirs(path)
        except OSError as exc: # Python >2.5
            if exc.errno == errno.EEXIST and os.path.isdir(path):
                pass
            else: raise

class MakeFileHandler(logging.FileHandler):
    def __init__(self, filename, mode="a", encoding=None, delay=0):            
        mkdir_p(os.path.dirname(filename))
        logging.FileHandler.__init__(self, filename, mode, encoding, delay)