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Middleware that displays everything that is printed inline in
application pages.
Anything printed during the request will get captured and included on
the page. It will usually be included as a floating element in the
top right hand corner of the page. If you want to override this
you can include a tag in your template where it will be placed::
<pre id="paste-debug-prints"></pre>
You might want to include ``style="white-space: normal"``, as all the
whitespace will be quoted, and this allows the text to wrap if
necessary.
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This middleware captures all the printed statements, and inlines
them in HTML pages, so that you can see all the (debug-intended)
print statements in the page itself.
There are two keys added to the environment to control this:
``environ['paste.printdebug_listeners']`` is a list of functions
that will be called everytime something is printed.
``environ['paste.remove_printdebug']`` is a function that, if
called, will disable printing of output for that request.
If you have ``replace_stdout=True`` then stdout is replaced, not
captured.
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