import pandas as pd
import os
import re
from pickle import dumps

def bump_rev(filename):
    pattern = "([^r]*)(\srev(\d)|).pdf"
    begin, _, rev_number =  re.match(pattern, filename).groups()
    rev_number = int(rev_number) + 1 if rev_number else 1
    return "{0} rev{1}.pdf".format(begin, rev_number)

def simple_serialize(obj):
    return dumps({c.name: getattr(obj, c.name) for c in  obj.__table__.columns})