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python记录程序运行时间的三种方法这里提供了python记录程序运行时间的三种方法，并附有实现代码，最后进行比较，大家参考下：方法112345import datetimestarttime = datetime.datetime.now()#long runningendtime = datetime.datetime.now()print (endtime - starttime).sec...

import pandas as pda=[1,2,3,1]b=["a","b","c","d"]df=pd.DataFrame({"A":a,"B":b})print(df.dtypes)答案：int64object    The dtype object comes from NumPy, it describes the type of element in a ndarra