python - PyCharm warning: "format doesn't require a mapping". What does it mean? -


for reason pycharm warns me line of code. i'm logging content of dictionary , gets warning: format doesn't require mapping

self._logger.info('device channels set: %s' % self._device_channels)

the code works fine , not important, i'm getting quite few of these , don't understand pycharm trying tell me.

i've googled not found helpful.

i assume pycharm warns using simple format string %s, while providing dictionary formatting argument. when using named formats (i believe %(name)s), dictionary argument can used fill format value of argument['name'].

to avoid warning, try coercing argument simple string yourself, matching format in string , argument provide:

self._logger.info('device channels set: %s' % str(self._device_channels))

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