Unknown python expression filename=r’/path/to/file’

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The r'..' string modifier causes the '..' string to be interpreted literally. That means, r'My\Path\Without\Escaping' will evaluate to 'My\Path\Without\Escaping' – without causing the backslash to escape characters. The prior is equivalent to 'My\\Path\\Without\\Escaping' string, but without the raw modifier.

Note: The string cannot end with an odd number of backslashes, i.e r'Bad\String\Example\' is not a correct string.

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