Have you considered using a templating library like Jinja2 or Mako? That's my
first thought whenever I want something that's too complicated for
`str.format()`. In addition to handling default values, these libraries would
also give you the ability to encode some simple logic in your files, which
My first thought was that this is a job for string.Template, which has
always struck me as subclassing-friendly. Took about a half hour of
wrangling the regex to get here:
from string import Template, _sentinel_dict
class TemplateWithDefaults(Template):
braceidpattern = r'([_a-z][_a-z0-9]*)
Oh, I didn't even know about `format_map`! Or `__format__` for that matter.
This makes everything much easier. For my purposes, I don't even need to use
`__format__` since I am not using format strings.
In a show of appreciation, here is a URL to a GIF of James Corden bowing:
https://media.giphy
On Fri, 1 Apr 2022 at 23:51, wrote:
>
> One way that I like to create templates for config files is to write the
> config file in a way that can be used with `str.format` if I read in the
> entire config file as a string before re-saving it or sending it somewhere.*
> The config file contains a
