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The standard library documentation "6.1. string — Common string operations" describes string formatting through the `.format` method and the corresponding mini-language, and the `Template` class. In the part describing the `Template` class (6.1.4) is the text:
> Instead of the normal %-based substitutions, Templates support $-based substitutions, using the following rules:
This is potentially confusing. The documentation in this section has not made any mention of %-based substitutions. Rather, a novel reader may, at this point, think that {}-based substitution is normal. I would suggest to resolve this issue by simply not mentioning %-based substitutions, replacing the sentence above by:
> Templates support $-based substitutions, using the following rules: