py.io

The ‘py’ lib provides helper classes for capturing IO during execution of a program.

IO Capturing examples

py.io.StdCapture

Basic Example:

>>> import py
>>> capture = py.io.StdCapture()
>>> print "hello"
>>> out,err = capture.reset()
>>> out.strip() == "hello"
True

For calling functions you may use a shortcut:

>>> import py
>>> def f(): print "hello"
>>> res, out, err = py.io.StdCapture.call(f)
>>> out.strip() == "hello"
True

py.io.StdCaptureFD

If you also want to capture writes to the stdout/stderr filedescriptors you may invoke:

>>> import py, sys
>>> capture = py.io.StdCaptureFD(out=False, in_=False)
>>> sys.stderr.write("world")
>>> out,err = capture.reset()
>>> err
'world'

py.io object reference