使用python在csv中每一行的末尾附加字典或值列表

Question

我想在 csv 文件的每一行末尾附加一个值列表，但标题除外。

我尝试了以下代码，但它删除了 csv 文件中的所有行，并且不会向 csv 文件附加任何值。

import tensorflow
from fer.fer import FER
import cv2
from os import listdir
from os.path import isfile, join
import numpy
import csv



f1 =     open("C:/Yasir/Thesis/4/FaceDetectionLatest/bin/Debug/Data/demoScoringData9.csv",   "a+")
reader = csv.reader(f1)
images = numpy.empty(len(onlyfiles), dtype=object)
for n in range(0, len(onlyfiles)):
    images[n] = cv2.imread( join(mypath,onlyfiles[n]) )
    # cv2.imshow(join(mypath,onlyfiles[n]),0)
    img = cv2.imread( join(mypath,onlyfiles[n]) )
    detector = FER()
    emotion = detector.detect_emotions(img)
    dict = emotion[0]
    emoList = dict['emotions']
    dict_writer = csv.DictWriter(f1, emoList)
    dict_writer.writerow(emoList)

我想将以下值附加到已创建的 csv 文件中。 我的意思是 dict 值应该附加到 csv 的每一行，除了下面的标题值。

{'愤怒'：0.15，'厌恶'：0.0，'恐惧'：0.05，'快乐'：0.06，'悲伤'：0.24，'惊讶'：0.02，'中性'：0.49}

我也分享了我的csv 文件截图的截图

Answer 1

这是将列附加到现有 CSV 的基本示例：

数据.csv（原始）

col1,col2,col3
1,2,3
4,5,6
7,8,9

测试文件

import csv

with open('data.csv',newline='') as fin:
    r = csv.DictReader(fin)
    lines = list(r)

with open('data.csv','w',newline='') as fout:
    # Create writer with existing column headers plus new column headers
    w = csv.DictWriter(fout,fieldnames=r.fieldnames + 'angry disgust fear happy sad surprise neutral'.split())
    w.writeheader()

    for line in lines:
        emolist = {'angry': 0.15, 'disgust': 0.0, 'fear': 0.05, 'happy': 0.06, 'sad': 0.24, 'surprise': 0.02, 'neutral': 0.49}
        line.update(emolist)
        w.writerow(line)

data.csv（最终版）

col1,col2,col3,angry,disgust,fear,happy,sad,surprise,neutral
1,2,3,0.15,0.0,0.05,0.06,0.24,0.02,0.49
4,5,6,0.15,0.0,0.05,0.06,0.24,0.02,0.49
7,8,9,0.15,0.0,0.05,0.06,0.24,0.02,0.49