Question

我有一个包含多个行和列的csv文件。我想使用python 3.4过滤我的文件并创建一个与行中某些值完全匹配的新文件。我的问题是我选择2列来过滤行：如果EQA nb与列表中组织的确切名称匹配，则将该行复制到新文件。

我的文件看起来像那样：

EQA_nb,organization,a,b,c,d
16,TCS,a1,b1,c1,d1
14,LS,a2,b2,c2,d2
14,BMC,a3,b3,c3,d3
2,TLS,a4,b4,c4,d4
6,LCHC,a5,b5,c5,d5
14,TLS,a6,b6,c6,d6
etc..

我的代码是：

import csv
with open ('data.csv','w',newline='') as outf, open('output.csv','r', newline='')as inf:
    reader = csv.DictReader(inf, delimiter=',')
    writer = csv.DictWriter(outf, fieldnames=reader.fieldnames, delimiter=',')
    writer.writeheader()

    for row in reader:
        if ((row["EQA_nb"]== '6' and row["organization"] in "EP, LCHC, SP")
                or (row["EQA_nb"]== "2" and row["organization"] in "AMC, LCHC, SGPLP, TCS, TLS")
                or (row["EQA_nb"]== "7" and row["organization"] in "GP")
                or (row["EQA_nb"]== "8" and row["organization"] in "LFMC")
                or (row["EQA_nb"]== "9" and row["organization"] in "LS")
                or (row["EQA_nb"]== "11" and row["organization"] in "DP, WSS")
                or (row["EQA_nb"]== "13" and row["organization"] in "TRP")
                or (row["EQA_nb"]== "14" and row["organization"] in "BMC,TLS")): 

            writer.writerow(row)

我想让新文件显示指定行值的精确匹配，即显示14 TLS但不是14 LS，例如当前代码所示。谢谢你的帮助！

Answer 1

替换

'BMC,TLS'

带

['BMP', 'TLS']

然后

row['organization'] in ['BMP', 'TLS']

将匹配＆＃39; TLS＆＃39;但不是＆＃39; LS＆＃39;

Answer 2

通过将匹配项放入字典中，将if / elif链简化为单个查找，可以很整洁地完成此操作，然后可以使用operator.itemgetter对其进行优化。

import csv
import operator


mapping = {
    "6": ["EP", "LCHC", "SP"],
    "2": ["AMC", "LCHC", "SGPLP", "TCS", "TLS"],
    "7": ["GP"],
    "8": ["LFMC"],
    "9": ["LS"],
    "11": ["DP", "WSS"],
    "13": ["TRP"],
    "14": ["BMC", "TLS"],
}


kv = operator.itemgetter("EQA_nb", "organization")


with open("data.csv", "w", newline="") as outf, open("output.csv", "r", newline="") as inf:
    reader = csv.DictReader(inf, delimiter=",")
    writer = csv.DictWriter(outf, fieldnames=reader.fieldnames, delimiter=",")
    writer.writeheader()

    for row in reader:
        eqa, org = kv(row)
        if org in mapping.get(eqa, []):
            writer.writerow(row)

python与csv文件中列值的完全匹配

2 个答案: