python - stripping a pattern from the end of the string -

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i want see if file test_100.webp exists , @ file test.yaml. therefore, need strip pattern "_100.webp" end. tried use code below , giving me issues. 

 i, image in enumerate(images_in_item):         if image.endswith("_100.webp"):             image_strip = image.rstrip(_100.webp)             snapshot_markup = os.path.join(image_strip + 'yaml')

do this:

suffix = '_100.webp' if image.endswith(suffix):     image_strip = image[:-len(suffix)]     snapshot_markup = os.path.join(image_strip + 'yaml')

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