advanced string formatting vs template strings

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Templates are meant to be simpler than the the usual string formatting, at the cost of expressiveness. The rationale of PEP 292 compares templates to Python’s %-style string formatting:

Python currently supports a string substitution syntax based on
C’s printf() ‘%’ formatting character. While quite rich,
%-formatting codes are also error prone, even for
experienced Python programmers. A common mistake is to leave off
the trailing format character, e.g. the s in %(name)s.

In addition, the rules for what can follow a % sign are fairly
complex, while the usual application rarely needs such complexity.
Most scripts need to do some string interpolation, but most of
those use simple “stringification” formats, i.e. %s or %(name)s
This form should be made simpler and less error prone.

While the new .format() improved the situation, it’s still true that the format string syntax is rather complex, so the rationale still has its points.

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