Where is "tidy" located in "twill"?

on "twill" documentation page it is written:

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By default, twill will run pages through tidy before processing them. This is on by default because the Python libraries that parse HTML a开发者_如何学JAVAre very bad at dealing with incorrect HTML, and will often return incorrect results on "real world" Web pages. To disable this feature, set config do_run_tidy 0

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But where is this tidy program located inside twill? I have downloaded "twill 0.9" and looked into "twill" folder contents - I just can't find there such a file (or a module) that would be named "tidy"

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twill uses the commandline version of tidy if installed on your system. the method that calls tidy to clean your code is located in the utils.py and named 'run_tidy'. its called by the command 'tidy_ok' which is defined in commands.py

if use_tidy is set to true (which it is by default) the _cleanup_html method in ConfigurableParsingFactory calls the run_tidy method