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doc/manual: add note about avoiding __del__

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Sebastien Bourdeauducq 2015-03-12 15:15:56 +01:00
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@ -172,6 +172,7 @@ The program below exemplifies how to use logging: ::
General guidelines General guidelines
------------------ ------------------
* Do not use ``__del__`` to implement the cleanup code of your driver. Instead, define a ``close`` method, and call it using a ``try...finally...`` block in the controller.
* Format your source code according to PEP8. We suggest using ``flake8`` to check for compliance. * Format your source code according to PEP8. We suggest using ``flake8`` to check for compliance.
* Use new-style formatting (``str.format``) except for logging where it is not well supported, and double quotes for strings. * Use new-style formatting (``str.format``) except for logging where it is not well supported, and double quotes for strings.
* The device identification (e.g. serial number) to attach to must be passed as a command-line parameter to the controller. We suggest using ``-s`` and ``--serial`` as parameter name. * The device identification (e.g. serial number) to attach to must be passed as a command-line parameter to the controller. We suggest using ``-s`` and ``--serial`` as parameter name.