Question

我有以下数据框：

       FAK_ART    FAK_DAT  LEIST_DAT      KD_CRM MW_BW       EQ_NR MATERIAL  \
0         ZPAF 2015-05-18 2015-05-31         TMD     E  1003507107  G230ETS   
1         ZPAF 2015-05-18 2015-05-31         TMD     B  1003507107  G230ETS   
2         ZPAF 2015-05-18 2015-05-31         TMD     E  1003507108  G230ETS   
3         ZPAF 2015-05-18 2015-05-31         TMD     B  1003507108  G230ETS   
4         ZPAF 2015-05-18 2015-05-31         TMD     E  1003507109  G230ETS   
5         ZPAF 2015-05-18 2015-05-31         TMD     B  1003507109  G230ETS   
6         ZPAF 2015-05-18 2015-05-31         TMD     E  1003507110  G230ETS   
7         ZPAF 2015-05-18 2015-05-31         TMD     B  1003507110  G230ETS   
8         ZPAF 2015-05-18 2015-05-31         TMD     E  1003507111  G230ETS

。。

387976    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022686   A60ETS   
387977    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022686   A60ETS   
387978    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     E  1001022712   A60ETS   
387979    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022712   A60ETS   
387980    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     E  1001022735   A60ETS   
387981    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022735   A60ETS   
387982    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022735   A60ETS   
387983    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     E  1001022748   A60ETS   
387984    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     B  1001022748   A60ETS   
387985    ZPAF 2016-02-12 2016-02-29  T-HOME ICP     E  1001022760   A60ETS

现在我想只选择日期为2015-05-31的行。

我尝试使用date_range处理它，但我总是遇到错误：

ValueError：值的长度与索引的长度
不匹配

或

ValueError：必须指定开始，结束或句点中的两个

我的想法是：

data_faktura['LEIST_DAT'] = pd.date_range('2016-01-31', '2016-01-31')

然后我收到错误！

我该如何解决或解决这个问题？

Answer 1

您可以LEIST_DAT列set_index，然后按ix选择：

#change 2016-02-29 to your datetime
data_fakture = data_fakture.set_index('LEIST_DAT').ix['2016-02-29']
print (data_fakture)
           FAK_ART     FAK_DAT      KD_CRM MW_BW       EQ_NR MATERIAL
LEIST_DAT                                                            
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022760   A60ETS

或loc：

data_fakture = data_fakture.set_index('LEIST_DAT').loc['2016-02-29']
print (data_fakture)
           FAK_ART     FAK_DAT      KD_CRM MW_BW       EQ_NR MATERIAL
LEIST_DAT                                                            
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022760   A60ETS

您也可以选择开始日期和结束日期：

data_fakture = data_fakture.set_index('LEIST_DAT').ix['2015-05-31':'2016-02-29']
print (data_fakture)
           FAK_ART     FAK_DAT      KD_CRM MW_BW       EQ_NR MATERIAL
LEIST_DAT                                                            
2015-05-31    ZPAF  2015-05-18         TMD     E  1003507107  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     B  1003507107  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     E  1003507108  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     B  1003507108  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     E  1003507109  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     B  1003507109  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     E  1003507110  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     B  1003507110  G230ETS
2015-05-31    ZPAF  2015-05-18         TMD     E  1003507111  G230ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022686   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022712   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022735   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     B  1001022748   A60ETS
2016-02-29    ZPAF  2016-02-12  T-HOME ICP     E  1001022760   A60ETS

通过date_range从DataFrame中选择行

1 个答案: