This is a popular misquote from the Zen of Python. The actual quote is “There should be one—and preferably only one—obvious way to do it.”

The misquote shifts the emphasis to uniqueness rather than having an obvious way to accomplish goals, and is probably a result of people disliking the “There is more than one way to do it” adage of Perl (and embraced by the Ruby community) looking to the Zen to find a banner for their opposing camp.