An enhanced version of yaptu, with the following changes - separated parsing from execution - added caching of parsed templates - added some error reporting - added a choice of template syntaxes - added comment syntax - added Cheetah-style variable substitution with optional caching of the equivalent Python expression - limited flow control to 'for' and 'if' Reasonably small, no external dependencies, pretty fast.

"Templating" (copying an input file to output, on the fly inserting Python expressions and statements) is a frequent need, and YAPTU is a small but complete Python module for that; expressions and statements are identified by arbitrary user-chosen regular-rexpressions.