Although I haven't tried it myself, I've heard from multiple sources that you can convert GeoPDFs to GeoTIFFs using gdal_translate, there's a tutorial here: StayGeo: Convert GeoPDF Maps to GeoTIFF with GDAL
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personally, I always specify paths using raw strings, e.g. r"C:\path\to\whatever", and use os.path.join() to append subdirectories and filenames to paths. So far, this has always worked like a charm.
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