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That allows people to overwrite it more easily. ## Exception, warnings.warn, logger_warning - Exceptions should be used if the user should write code that deals with an error case, e.g. the PDF being completely broken. - warnings.warn should be used if the user needs to fix their code, e.g. DeprecationWarnings - logger_warning should be used if the user needs to know that an issue was handled by PyPDF2, e.g. a non-compliant PDF being read in a way that PyPDF2 could apply a robustness fix to still read it. This applies mainly to strict=False mode. 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