Python 字典，读取列表并附加字典的值

Question

我有一个示例输入 csv 文件（制成列表），如下所示：

Alfa,Beta,Charlie,Delta,Echo
A1,B1,C1,D1,AX1
A2,B2,C2,D2,BX1
A3,B3,C3,D3,CX1
A4,B4,C4,D4,BX1/CX1
A4,B4,C4,D4,CX1/AX1
A4,B4,C4,D4,AX1/BX1

然后我的示例代码如下所示：

#feed is the list I posted above

column_numbers = 'Echo'

ID_dict = {"AX1" : "AA1,AA2,AA3",
           "BX1" : "BB1,BB2,BB3",
           "CX1" : "CC1,CC2,CC3"
           }

for row in feed: 
    column_key = row[column_numbers]
    for item in ID_dict[column_key].split(','):
        row[column_numbers] = item
        print(item)

如果我运行它并打印（项目），我将获得的“Echo”列的结果将是：

AA1
AA2
AA3
BB1
BB2
BB3
CC1
CC2
CC3

但是，由于我发布的列表中有“BX1/CX1、CX1/AX1 和 AX1/BX1”，我该如何在读取 BX1/CX1 的位置添加它，然后从字典中附加正确的值。 例如，如果显示 BX1/CX1，则应为 output：

BB1
BB2
BB3
CC1
CC2
CC3

或者如果它说 BX1/AB1/CX1，它将使用字典然后添加值，它应该是 output：

BB1
BB2
BB3
AA1
AA2
AA3
CC1
CC2
CC3

Answer 1

cat sample.csv                                                                                                                                                            
Alfa,Beta,Charlie,Delta,Echo
A1,B1,C1,D1,AX1
A2,B2,C2,D2,BX1
A3,B3,C3,D3,CX1
A4,B4,C4,D4,BX1/CX1
A4,B4,C4,D4,CX1/AX1
A4,B4,C4,D4,AX1/BX1

import csv

with open('sample.csv') as csv_file:
    column_numbers = 'Echo'
    ID_dict = {"AX1" : "AA1,AA2,AA3",
           "BX1" : "BB1,BB2,BB3",
           "CX1" : "CC1,CC2,CC3"
           }
    reader = csv.DictReader(csv_file)
    for row in reader:
        if row[column_numbers]:
            for ky in row[column_numbers].split('/'):
                for item in ID_dict[ky].split(','):
                    print(item)



AA1
AA2
AA3
BB1
BB2
BB3
CC1
CC2
CC3
BB1
BB2
BB3
CC1
CC2
CC3
CC1
CC2
CC3
AA1
AA2
AA3
AA1
AA2
AA3
BB1
BB2
BB3

Answer 2

字符串有一个split() function 通过在一些分隔符上拆分字符串来创建一个数组。

> 'abc'.split('/')   # The return value is always an array
['abc']
> 'a/b/c'.split('/')
['a', 'b', 'c']