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删除重复数据 阅读全文
posted @ 2021-02-19 17:32
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In import pandas as pdIn import numpy as npIn dtaes=['2016-01-01','2016-01-02','2016-01-03','2016-01-04','2016-01-05','2016-01-06']In dates=pd.to_date 阅读全文
posted @ 2021-02-19 16:47
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In from datetime import datetimeIn import pandas as pdIn date=datetime(2016,1,1)In date=pd.Timestamp(date)Out date Timestamp('2012-01-01 00:00:00') In 阅读全文
posted @ 2021-02-19 15:31
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In import pandas as pdIn import numpy as npIn S1=pd.Series()In S1Out Series([],dtype:float64) In S2=pd.Series([1,3,5,7,9],index=['a','b','c','d','e',] 阅读全文
posted @ 2021-02-19 14:28
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In ar1=np.array(np.arange(5))Out array([0,1,2,3,4]) In np.add(ar1,4) #每个元素都加4Out array([4,5,6,7,8]) In ar2=np.array([2,3,4,5,6])In ar1+ar2Out array([2 阅读全文
posted @ 2021-02-19 13:22
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In a1=np.linspace(1,26,6,dtype=int)Out array([1,6,11,16,21,26]) In a1[1:3] #array[start:end]Out array([6,11]) In a1[:5]Out array([1,6,11,16,21]) In a1 阅读全文
posted @ 2021-02-19 13:03
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