我正在尝试根据每个文件中的特定字段合并两个 CSV 文件。
文件1.csv
id,attr1,attr2,attr3
1,True,7,"Purple"
2,False,19.8,"Cucumber"
3,False,-0.5,"A string with a comma, because it has one"
4,True,2,"Nope"
5,True,4.0,"Tuesday"
6,False,1,"Failure"
文件2.csv
id,attr4,attr5,attr6
2,"python",500000.12,False
5,"program",3,True
3,"Another string",-5,False
这是我正在使用的代码:
import csv
from collections import OrderedDict
with open('file2.csv','r') as f2:
reader = csv.reader(f2)
fields2 = next(reader,None) # Skip headers
dict2 = {row[0]: row[1:] for row in reader}
with open('file1.csv','r') as f1:
reader = csv.reader(f1)
fields1 = next(reader,None) # Skip headers
dict1 = OrderedDict((row[0], row[1:]) for row in reader)
result = OrderedDict()
for d in (dict1, dict2):
for key, value in d.iteritems():
result.setdefault(key, []).extend(value)
with open('merged.csv', 'wb') as f:
w = csv.writer(f)
for key, value in result.iteritems():
w.writerow([key] + value)
我得到这样的输出,它适当地合并,但所有行的属性数量不同:
1,True,7,Purple
2,False,19.8,Cucumber,python,500000.12,False
3,False,-0.5,"A string with a comma, because it has one",Another string,-5,False
4,True,2,Nope
5,True,4.0,Tuesday,program,3,True
6,False,1,Failure
file2
不会有每个记录id
in file1
。我希望输出有空字段file2
在合并的文件中。例如,id
1 看起来像这样:
1,True,7,Purple,,,
如何将空字段添加到没有数据的记录中file2
这样合并后的 CSV 中的所有记录都具有相同数量的属性吗?