import os

class Config:
    def __init__(self, filename):
        self.filename = filename
        self.vars = {}
        if os.path.isfile(filename):
            f = open(filename, 'r')
            eval(f, self.vars)

    def write(self):
        f = open(self.filename, 'w')
        for var in self.vars:
            f.write("%s = %s\n" % (var, repr(self.vars[var])))
        f.close()