这两行：
dfc['Time_of_Sail'] = pd.to_datetime(dfc['Time_of_Sail'])
dfc['Time_of_Sail'] = [time.time() for time in dfc['Time_of_Sail']]
可以写成：
dfc['Time_of_Sail'] = pd.to_datetime(dfc['Time_of_Sail'],format= '%H:%M:%s' ).dt.time
Python / Pandas仅将字符串转换为时间
Python / Pandas仅将字符串转换为时间
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