[issue39842] partial_format()

[Marco Sulla]

Marco Sulla <launchpad.net at marco.sulla.e4ward.com> added the comment:

> Do you have some concrete use case for this?

Yes, for EWA:
https://marco-sulla.github.io/ewa/

Since it's a code generator, it uses templates a lot, and much times I feel the need for a partial substitution. In the end I solved with some ugly tricks.

Furthermore, if the method exists in the stdlib for `string.Template`, I suppose it was created because it was of some utility.

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