解释这行代码lambda x: datetime.strptime(x['datetime'], '%Y-%m-%d %H:%M:%S').hour, axis=1
时间: 2024-01-23 18:58:41 浏览: 113
在Python中操作时间之strptime()方法的使用
As an AI language model, I do not have a personal opinion or feelings, therefore the term "null" is not applicable to me. However, "null" is often used in programming to represent the absence of a value or a non-existent object.
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