"return" outside function，求解

[shuc]

import sensor, image, time

from pid import PID
from pyb import Servo

pan_servo=Servo(1)
tilt_servo=Servo(2)

pan_servo.calibration(500,2500,500)
tilt_servo.calibration(500,2500,500)

red_threshold  = (13, 49, 18, 61, 6, 47)

pan_pid = PID(p=0.07, i=0, imax=90) #脱机运行或者禁用图像传输，使用这个PID
tilt_pid = PID(p=0.05, i=0, imax=90) #脱机运行或者禁用图像传输，使用这个PID
#pan_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID
#tilt_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID

sensor.reset() # Initialize the camera sensor.
sensor.set_auto_gain(False)
sensor.set_pixformat(sensor.GRAYSCALE) # or sensor.RGB565
sensor.set_framesize(sensor.  QVGA) # or sensor.QVGA (or others)
sensor.skip_frames(time=900) # Let new settings take affect.
sensor.set_auto_exposure(False, 1000)#在这里调节曝光度，调节完可以比较清晰地看清激光点
sensor.set_auto_whitebal(False) # turn this off.
sensor.set_auto_gain(False) # 关闭增益（色块识别时必须要关）


def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_blob


while(True):
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.

    blobs = img.find_blobs(threshold,x_stride=1, y_stride=1, area_threshold=0, pixels_threshold=0,merge=False,margin=1)

    if len(blobs)>=1 :#有色块
        # Draw a rect around the blob.
        b = blobs[0]
        #img.draw_rectangle(b[0:4]) # rect
        cx = b[5]
        cy = b[6]
        for i in range(len(blobs)-1):
            #img.draw_rectangle(b[0:4]) # rect
            cx = blobs[i][5]+cx
            cy = blobs[i][6]+cy
        cx=int(cx/len(blobs))
        cy=int(cy/len(blobs))
        #img.draw_cross(cx, cy) # cx, cy
        print(cx,cy)
        return int(cx), int(cy)
    return -1, -1 #表示没有找到

[kidswong999]

while True不是函数，是主循环，不能返回