我想将 2 个 CSV 文件合并到一个 CSV 中,并根据一列(第二列)删除所有重复的行。
这是我的第一个 CSV 文件:
Skufnoo,748702985,-6026769894509215039,ВупÑень пупÑень â¤ï¸â€ðŸ©¹ðŸ’—,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,4,True,False,0
mAtkmb,5213786988,4161254730445748607,ДаниÑль Блинов,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,False,False,False,0
sheluvjoseph,1421438213,8544915453690665435,អន សំអុល,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
第二个 CSV 文件:
cchamnap,748702985,-7259273529368744780,Chim,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
chhounkha,765670208,3636141294788837002,Chhuon Sokha,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,False,False,False,0
CHHORMNIMOL8,5213786988,5104468652588260401,ឌី ណា.,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
Chhailin17,1133044248,6931066845789435875,Chhai Lin,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
输出文件(own_updated2.csv)应该是:
Skufnoo,748702985,-6026769894509215039,ВупÑень пупÑень â¤ï¸â€ðŸ©¹ðŸ’—,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,4,True,False,0
mAtkmb,5213786988,4161254730445748607,ДаниÑль Блинов,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,False,False,False,0
sheluvjoseph,1421438213,8544915453690665435,អន សំអុល,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
chhounkha,765670208,3636141294788837002,Chhuon Sokha,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,False,False,False,0
Chhailin17,1133044248,6931066845789435875,Chhai Lin,AA2888 ចាក់បាល់និងកាសុីណូអនឡាញ (070645555),1746008070,False,False,5,True,False,0
我尝试过以下代码:
import pandas as pd
import csv
df1 = pd.read_csv("own1.csv")
df2 = pd.read_csv("own2.csv")
merged = pd.concat([df1,df2])
with open('own_updated.csv', 'w', newline="", encoding='utf-8') as nf:
merged.to_csv(nf, index=False)
with open('own_updated.csv', 'r', encoding="utf8") as in_file, open('own_updated2.csv', 'w', newline="", encoding="utf8") as out_file:
in_data = csv.reader(in_file, delimiter=',')
writer=csv.writer(out_file)
tracks = set() # Tracking duplicates of the second column's cell
for row in in_data:
key = row[1]
if key not in tracks:
writer.writerow(row)
tracks.add(key)
效果很好。但问题是有一个不需要的额外文件 own_updated.csv。如何存储合并两个 CSV 文件的所有数据而不创建 own_updated.csv 文件,即将它们存储在内存中,然后根据第二列处理删除重复项?
您不需要使用额外的文件,只需从合并的数据框中删除重复项即可
您应该使用 pandas 中的构建方法 drop_duplicates。这是代码:
把事情简单化...:
此时,结果字典的value()中已包含合并的数据。根据定义,基于 row[1] 的字典键不能有重复项