logging module and doctest

[Gary Jefferson]

I've written a logging.filter and would like to use doctest on it
(using a StreamHandler for stdout), but this doesn't seem possible.
Output from the logger seems to disappear (running the doctest strings
through the interpreter as-is yields expected results). I assume this
is because doctest does something with logging. Is there any way to
make these work together?

Gary

[Peter Otten]

Gary Jefferson wrote:

I've written a logging.filter and would like to use doctest on it
(using a StreamHandler for stdout), but this doesn't seem possible.
Output from the logger seems to disappear (running the doctest strings
through the interpreter as-is yields expected results). I assume this
is because doctest does something with logging.

It redirects stdout to a StringIO subclass to capture the output.

Is there any way to make these work together?

Using the StreamHandler with something like

class WrapStdOut(object):
def __getattr__(self, name):
return getattr(sys.stdout, name)

instead of sys.stdout directly should work.

Peter

[Peter Otten]

Peter Otten wrote:

Gary Jefferson wrote:

>I've written a logging.filter and would like to use doctest on it
(using a StreamHandler for stdout), but this doesn't seem possible.
Output from the logger seems to disappear (running the doctest strings
through the interpreter as-is yields expected results). I assume this
is because doctest does something with logging.

It redirects stdout to a StringIO subclass to capture the output.

>Is there any way to make these work together?

Using the StreamHandler with something like

class WrapStdOut(object):
def __getattr__(self, name):
return getattr(sys.stdout, name)

instead of sys.stdout directly should work.

Or create the StreamHandler inside your doctest where sys.stdout is already
redirected.

Peter

[Gary Jefferson]

Peter Otten wrote:

Peter Otten wrote:

Gary Jefferson wrote:

I've written a logging.filter and would like to use doctest on it
(using a StreamHandler for stdout), but this doesn't seem possible.
Output from the logger seems to disappear (running the doctest strings
through the interpreter as-is yields expected results). I assume this
is because doctest does something with logging.

It redirects stdout to a StringIO subclass to capture the output.

Is there any way to make these work together?

Using the StreamHandler with something like

class WrapStdOut(object):
def __getattr__(self, name):
return getattr(sys.stdout, name)

instead of sys.stdout directly should work.

Or create the StreamHandler inside your doctest where sys.stdout is already
redirected.

Peter

I was creating the StreamHandler inside doctest. Turns out, however,
that I hadn't imported 'sys', and so it didn't work. Its a little
strange that this didn't result in an error, but there you have it.

Thanks for the tip that led me to discover this.

Gary