pandas是基于NumPy的一种数据分析工具，在机器学习任务中，我们首先需要对数据进行清洗和编辑等工作，pandas库大大简化了我们的工作量，熟练并掌握pandas常规用法是正确构建机器学习模型的第一步(Pandas is a data analysis tool based on NumPy. In the machine learning task, we first need to clean and edit the data. The Library of Pandas greatly simplifies our workload, and mastering the general usage of Pandas is the first step to correctly build the machine learning model)