OpenCV: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive] Problem: ```sh opencv/modules/python/src2/cv2.cpp:856:34: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive] 856 | char* str = PyString_AsString(obj); In file included from /home/yubao/Software/opencv/modules/python/src2/cv2.cpp:1498: ``` Solution: Modify: opencv/modules/python/src2/cv2.cpp From: ```cpp char* str = PyString_AsString(obj); ``` to: ```cpp const char* str = PyString_AsString(obj); ```