将字典结果附加到python中的csv

时间:2013-11-03 21:06:15

标签: python csv

我希望在CSV文件中附加一个字典,我已经有了一个标题行 如果某个值不存在,我想写'-999'

SDict ={T1:'A',T2:'B',T4:'D')

其中CSV文件的标题为

T1,T2,T3,T4,T5
7,8,9,10,11

并且预期结果是

T1,T2,T3,T4,T5
7,8,9,10,11
A,B,-999,D,-999

我正在尝试使用代码:

import sys
import os
import csv

def GetFileHeader(Fpath):
    i=10
    ResFile=open (Fpath, 'r+')
    HeaderDict={}
    r=csv.reader(ResFile)
    HeaderList = r.next()
    for Header in HeaderList:
        HeaderDict[Header]=i+1
    print HeaderDict
    ResFile.close()
    return HeaderDict


Fpath= r'Z:\temp\assaf\S2TTP\S2T_TP\modules\results\Y124\res.csv'

Header= GetFileHeader(Fpath)

with open(Fpath,'rb') as fin:
    dr = csv.DictReader(fin, dialect='excel')
    print dr
    print dr.fieldnames
# dr.fieldnames contains values from first row of `f`.
with open(Fpath,'ab+') as fou:
    dw = csv.DictWriter(fou, dialect='excel', fieldnames=dr.fieldnames)
    fieldnames=dr.fieldnames
    for K in fieldnames:
        dw.writerow(Header[k])

1 个答案:

答案 0 :(得分:3)

我认为你可以做到:

import csv

SDict = {'T1': 'A', 'T2': 'B', 'T4': 'D'}

with open('file.csv', 'r+b') as f:
    header = next(csv.reader(f))
    dict_writer = csv.DictWriter(f, header, -999)
    dict_writer.writerow(SDict)

这假设您使用的是Python 2.X.另外,要警惕不以换行符结尾的文件,否则最终会出现7,8,9,10,11A,B,-999,D,-999之类的行。