解决人脸识别考勤系统重复写入CSV文件的问题

from datetime import datetime

def markAttendance(name):
    with open('Attendance.csv', 'r+') as f:
        myDataList = f.readlines()
        nameList = []
        for line in myDataList:
            entry = line.split(',')
            nameList.append(entry[0])

        if name not in nameList:
            now = datetime.now()
            dtString = now.strftime('%H:%M:%S')
            f.writelines(f'\n{name},{dtString}')

def readNames():
    try:
        with open('Attendance.csv', 'r') as f:
            nameList = [line.split(',')[0] for line in f]
    except FileNotFoundError:
        # 如果文件不存在，创建一个空文件并返回一个空列表
        open('Attendance.csv', 'w').close()
        nameList = []
    return nameList

def markAttendance(name, nameList):
    if name not in nameList:
        nameList.append(name)
        with open('Attendance.csv', 'a') as f:
            dt = datetime.now().strftime('%H:%M:%S')
            f.writelines(f'\n{name},{dt}')

# --- 主程序 ---
nameList = readNames()  # 在程序启动时读取姓名列表

cap = cv2.VideoCapture(0)

while True:
    # ... (人脸识别代码) ...

    for encodeFace, faceLoc in zip(encodesCurFrame, facesCurFrame):
        matches = face_recognition.compare_faces(encodeListKnown, encodeFace)
        faceDis = face_recognition.face_distance(encodeListKnown, encodeFace)
        matchIndex = np.argmin(faceDis)

        if matches[matchIndex]:
            name = classNames[matchIndex].upper()
            # ... (绘制矩形框和文字) ...
            markAttendance(name, nameList) # 传递 nameList