Hi @ak4zh

We discussed this feature several times in the developers chat. But never came to a good way to offer it.
The following are the requirements and thinkpoints we've come up with so far

• If a default parse_mode is set and none is given. Add it.
• If a default parse_mode is set and another parse_mode is given. Use the given one
• If a default parse_mode is set and None is given. Use no parse_mode
• Default parse_mode should be used for text messages and captions for every media type
• Default parse_mode should be used for answers to an inline_query <- This is the very tricky one.
• Tests for all the above.

Right now your PR is not up to these requests. Are you willing to put in some work to try a solution as I just described?

Regarding:

If a default parse_mode is set and None is given. Use no parse_mode

What seems a better approach.

-> Default parse mode is set, so it always uses the default one and use other parse_mode if something is passed specifically.

To use no parse_mode you can pass parse_mode=False and no parse mode will be used.

Will look something like:

if parse_mode:
    data[‘parse_mode’] = parse_mode
elif parse_mode is False:
    data[‘parse_mode’] = None
elif self.parse_mode:
    data[‘parse_mode’] = self.parse_mode

Or another approach can be, adding another parameter

use_default_parse_mode=True

So whenever you pass nothing in parse_mode it’s None and will use default parse mode (if anything is set)

If you want to use no parse mode, just pass

use_default_parse_mode=False

will be implemented with #1490, closing