Best practice for config files?

I recently wrote a program to do some record-keeping for me. I found
myself hard-coding a bunch of different values into it. This didn't
seem right, so I made my first use of configparser.ConfigParser().
Created the configuration file and everything is working fine.
However, I wrote it based on the assumption that the program is
running in the directory where the config file is stored, and has
a specific name. I started having some second thoughts here.
I thought about putting the location of the configuration file in
the configuration file, but that seemed like a non-starter.[1]
Should I specify the location of the config file with a command-line
option, or is requiring the program to be executed in the directory
containing the configuration file considered acceptable practice?
[1] See Tegan Jovanka in _Castrovalva_ for more on this idea.
--
Michael F. Stemper
If it isn't running programs and it isn't fusing atoms, it's just bending space.