Python中的单引号与双引号根据文档,它们基本上是可以互换的。是否有一个风格上的理由来使用一个而另一个呢?
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LIGHT_MESSAGES = { 'English': "There are %(number_of_lights)s lights.", 'Pirate': "Arr! Thar be %(number_of_lights)s lights."}def lights_message(language, number_of_lights): """Return a language-appropriate string reporting the light count.""" return LIGHT_MESSAGES[language] % locals()def is_pirate(message): """Return True if the given message sounds piratical.""" return re.search(r"(?i)(arr|avast|yohoho)!", message) is not None
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