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We are writing a small utility function called is_valid_mime_type. The function takes a mime_typeas an argument and checks if the mime type is one of the allowed types. Code looks like ALLOWED_MIME_TYPE = ('application/json', 'text/plain', 'text/html') def is_valid_mimetype(mime_type): """Returns True or False. :param mime_type string or unicode: HTTP header mime type """ for item in ALLOWED_MIME_TYPE: if mime_type.startswith(item): return True return False Above code can refactored into single line using any. [Read More]