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我想编写一段代码，在其中按住一个键，直到执行另一个操作。这是我的代码：

'''
virtual steering wheel 

hold your hand as you hold steering wheel 
turn right 
turn left 
'''

import cv2
import mediapipe as mp
import math 
import keyboard

mp_drawing = mp.solutions.drawing_utils
mp_hands = mp.solutions.hands

switch_hand = 1
decider = 0


# For webcam input:
cap = cv2.VideoCapture(0)
with mp_hands.Hands(
    min_detection_confidence=0.5,
    min_tracking_confidence=0.5) as hands:
  while cap.isOpened():
    success, image = cap.read()
    if not success:
      print("Ignoring empty camera frame.")
      # If loading a video, use 'break' instead of 'continue'.
      continue

    # Flip the image horizontally for a later selfie-view display, and convert
    # the BGR image to RGB.
    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
    # To improve performance, optionally mark the image as not writeable to
    # pass by reference.
    image.flags.writeable = False
    results = hands.process(image)


    # Draw the hand annotations on the image.
    image.flags.writeable = True
    image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)

    right_temp = []
    left_temp = []

    if results.multi_hand_landmarks:
      for hand_landmarks in results.multi_hand_landmarks:
        mp_drawing.draw_landmarks(image, hand_landmarks, mp_hands.HAND_CONNECTIONS)
        
        # x and y cordinates of thumbtip
        if switch_hand == 1:
          right_temp.append([float(hand_landmarks.landmark[mp_hands.HandLandmark.WRIST].x), float(hand_landmarks.landmark[mp_hands.HandLandmark.WRIST].y)])
        
        elif(switch_hand == -1):
          left_temp.append([float(hand_landmarks.landmark[mp_hands.HandLandmark.WRIST].x), float(hand_landmarks.landmark[mp_hands.HandLandmark.WRIST].y)])  

        switch_hand *= -1 

        if(len(right_temp) == 1 or len(left_temp) == 1):
            try:  
              myradians = math.atan2(right_temp[0][1]- left_temp[0][1], right_temp[0][0] - left_temp[0][0])
              mydegrees = int(math.degrees(myradians))
              #print(int(mydegrees))

              if(int(mydegrees > 14) or (-170 < mydegrees <  -160)):
                print("right")
                keyboard.press('d')

              elif(int(mydegrees <-15)):
                print("left")
                keyboard.press('a')
    
              else:
                print("nothing")
                keyboard.release()
            except:
              pass

        
    cv2.imshow('View pannel', image)
    if cv2.waitKey(5) & 0xFF == 27:
      break
cap.release()

当代码输出“右”时，我想像在物理世界中那样按住“d”键，一旦代码输出“左”就松开键，反之亦然。

我的代码的问题是：
    在循环的每一步中，它都会按下并释放一个键，类似于多次按下一个键。

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