IndentationError: 期望等待键中有一个缩进块

Question

File "<ipython-input-6-b985bbbd8c62>", line 21

    cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)
      ^
IndentationError: expected an indented block

我的代码

import cv2

import numpy as np

#variables

#True while mouse button down, False while mouse button up

drawing = False

ix,iy = -1

#Function

def draw_rectangle(event,x,y,param,flags):

    global ix,iy,drawing

    if event == cv2.EVENT_LBUTTONDOWN:

        drawing = True

        ix,iy = x,y

    elif event == cv2.EVENT_MOUSEMOVE:

        if drawing == True:

        cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)

    elif event == cv2.EVENT_LBUTTONUP:

        drawing = False

        cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)

#Showing images with opencv

#black

img = np.zeros((612,612,3))

cv2.namedwindow(winname='draw_painting')

cv2.setMouseCallback('draw_painting',draw_rectangle)

while True:


        cv2.imshow('draw_painting',img)

        cv2.waitkey(20) & 0xFF = 27:

            break

    cv2.destryAllWindows()

Answer 1

这是您当前的代码：

elif event == cv2.EVENT_MOUSEMOVE:
    if drawing == True:
    cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)

请注意，在 if 语句之后，您需要缩进代码：

elif event == cv2.EVENT_MOUSEMOVE:
    if drawing == True:
        cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)

其他错误：

此外，您似乎打算将最终的 if 语句放在 if 块内，并记住使用==而不是=来检查是否相等。

Answer 2

您需要在 if 语句之后给行缩进

if drawing == True:

    cv2.rectangle(img,(ix,iy),(x,y),(255,0,0),-1)