在 haystack 字符串中找出 needle 字符串出现的第一个位置 (从0开始)。如果不存在，则返回 -1。
Try out the examples in the examples folder using the binder service. The package can also be installed on Google Colab using the commands: The easiest way to get started with the Control Systems ...
𝗧𝘄𝗼 𝗣𝗼𝗶𝗻𝘁𝗲𝗿𝘀 𝗔𝗿𝗲𝗻’𝘁 𝗔 𝗧𝗿𝗶𝗰𝗸. 𝗧𝗵𝗲𝘆’𝗿𝗲 𝗔 𝗪𝗮𝘆 𝗢𝗳 ...
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