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The Cython debugger

The current directory should contain a directory named 'cython_debug', or a
path to the cython project directory should be given (the parent directory of
cython_debug).

Additional gdb args can be provided only if a path to the project directory is
given.
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            set print pretty on

            python
            # Activate virtualenv, if we were launched from one
            import os
            virtualenv = os.getenv('VIRTUAL_ENV')
            if virtualenv:
                path_to_activate_this_py = os.path.join(virtualenv, 'bin', 'activate_this.py')
                print("gdb command file: Activating virtualenv: %s; path_to_activate_this_py: %s" % (
                    virtualenv, path_to_activate_this_py))
                with open(path_to_activate_this_py) as f:
                    exec(f.read(), dict(__file__=path_to_activate_this_py))

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            end
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