python format

src/dynamic_graph/__init__.py

src/dynamic_graph/attrpath.py

src/dynamic_graph/entity.py

src/dynamic_graph/matlab.py

src/dynamic_graph/script_shortcuts.py

src/dynamic_graph/signal_base.py

src/dynamic_graph/tools.py

unitTesting/test_custom_entity.py

unitTesting/test_python-name_error.py

unitTesting/test_python-ok.py

unitTesting/test_python-restart_interpreter.py

unitTesting/test_python-syntax_error.py