Consider adding alternate FormattedComponent using string.Template

[klauer]

This would more closely mimic how epics-base does string interpolation.
https://docs.python.org/3/library/string.html#template-strings

Copying in the documentation relevant portions and example:

• $identifier names a substitution placeholder matching a mapping key of "identifier". By default, "identifier" is restricted to any case-insensitive ASCII alphanumeric string (including underscores) that starts with an underscore or ASCII letter. The first non-identifier character after the $ character terminates this placeholder specification.

• ${identifier} is equivalent to $identifier. It is required when valid identifier characters follow the placeholder but are not part of the placeholder, such as "${noun}ification".

• $$ is an escape; it is replaced with a single $.

>>> from string import Template
>>> s = Template('$who likes $what')
>>> s.substitute(who='tim', what='kung pao')
'tim likes kung pao'
>>> d = dict(who='tim')
>>> Template('Give $who $100').substitute(d)
Traceback (most recent call last):
...
ValueError: Invalid placeholder in string: line 1, col 11
>>> Template('$who likes $what').substitute(d)
Traceback (most recent call last):
...
KeyError: 'what'
>>> Template('$who likes $what').safe_substitute(d)
'tim likes $what'

(Had I known it existed in 2015, I would've used it in the first place...)

[danielballan]

Should we call it TemplatedComponent? Easy enough to explain that FormattedComponent uses str.format and TemplatedComponent uses string.Template.

[klauer]

TemplatedComponent would be the Python name
MacroComponent would be the EPICS name

I'll leave it at that 🤷‍♂️

[danielballan]

How about TemproComponent? MacplateComponent?

[danielballan]

^ PSA: This is a joke. :-D

[mrakitin]

I thought it's a pair of names from the latest Star Wars 😄

[prjemian]

A musical term, as in: senza sordino TemproComponent ma non troppo Maksim Rakitin wrote:

…

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