为什么在循环外出现语法错误"中断"？

Question

我有这段代码，我不知道为什么我Break outside loop收到错误。你可以帮我吗？

def TrackImage():
recognizer = cv2.face_LBPHFaceRecognizer.create()
recognizer.read('C:/Users/Jin/Anaconda3/envs/final/TrainingImageLabel/Trainner.yml')
harcascadePath = ("C:/Users/Jin/Desktop/python opencv/opencv/build/etc/haarcascades/haarcascade_frontalface_default.xml")
faceCascade = cv2.CascadeClassifier(harcascadePath)
df=pd.read_csv('StudentDetails/studentDetails.csv')
cam=cv2.FONT_HERSHEY_SIMPLEX
col_names = ['Id','Name','Date','Time']
attendance = pd.DataFrame(Columns = col_names)
while True:
ret, img = cam.read()
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
faces = detector.detectMultiScale(gray,1.3,5)
for (x,y,w,h) in faces:
cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
Id, conf = recognizer.predict(gray[y:y+h, x:x+w])
if (conf < 50):
ts = time.time()
date=datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d')
timeStamp = datetime.datetime.fromtimestamp(ts).strftime('%H:%M,%S')
aa = df.loc[df['Id'] == Id]['Name'].values
tt=str(Id)+"-"+aa
attendance.loc[len(attendance)] = [Id,aa,date,timeStamp]
else:
Id='Unknown'
tt=str(Id)
if(conf>75):
noOfFile=len (os.listdir("ImagesUnknown"))+1
cv2.imwrite("ImagesUnknownImage"+str(noOfFile)+".jpg",im[y:y+h,x:x+w])
cv2.putText(im,str(tt),(x,y+h), font, 1 ,(255,255,255),2)
attendance= attendance.drop_duplicates(subset=['Id'],keep='first')
cv2.imshow('im',im)
if(cv2.waitKey(1)==ord('q')):
break

Answer 1

因为break仅用于强制退出循环。在发布的代码中，您使用break退出if条件，这是非法的。在您的情况下，您可以使用exit.

中断文档

Answer 2

检查代码的最后两行。break超出任何循环的地方。

如果需要，请将其放在特定的循环中，否则将其删除。