Terry J. Reedy added the comment: Here is a proof of concept Python function, with a minimal test. It is similar to how str.format could be coded in Python, with re.split and ''.join, except that it does not allow anything before : in the format specification. By default (no format spec given), it copies bytes objects without change. If a format specification *is* given, it does not restrict the object, as this code simply uses builtin format sandwiched between decode and encode.
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