creating: find-books/
                  
                  
                    inflating: find-books/find_books.py  
                  
                  
                    inflating: find-books/.DS_Store    
                  
                  
                    inflating: find-books/example.jpg  
                  
                  
                  user@msp430:~/work/opencv_python$ cd find-books/
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ ls
                  
                  
                  example.jpg  find_books.py
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ python3 find_books.py 
                  
                  
                    File "find_books.py", line 38
                  
                  
                      cv2.imwrite("output.jpg", image))
                  
                  
                        ^
                  
                  
                  SyntaxError: invalid syntax
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ vim find_books.py 
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ python3 find_books.py 
                  
                  
                    File "find_books.py", line 38
                  
                  
                      cv2.imwrite("output.jpg", image))
                  
                  
                                                      ^
                  
                  
                  SyntaxError: invalid syntax
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ vim find_books.py 
                  
                  
                  user@msp430:~/work/opencv_python/find-books$ python3 find_books.py 
                  
                  
                  Traceback (most recent call last):
                  
                  
                    File "find_books.py", line 28, in <module>
                  
                  
                      peri = cv2.arcLength(c, True)
                  
                  
                  cv2.error: OpenCV(4.1.0) /io/opencv/modules/imgproc/src/shapedescr.cpp:239: error: (-215:Assertion failed) count >= 0 && (depth == CV_32F || depth == CV_32S) in function 'arcLength'
                  
                  
                
Там где invalid syntax убери лишнюю скобку
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