How cv2. waitKey(1) 0xff == ord(q) works? - Stack Overflow Second: The ord () method returns an integer representing a Unicode code point for the given Unicode character In your code you want the user to select the letter 'q' which is translated to the Unicode value of '113 ' Third: 0xFF is a hexadecimal constant which is 11111111 in binary
python - Usage of ord (q) and 0xFF - Stack Overflow ord('q') returns the Unicode code point of q cv2 waitkey(1) returns a 32-bit integer corresponding to the pressed key 0xFF is a bit mask which sets the left 24 bits to zero, because ord() returns a value betwen 0 and 255, since your keyboard only has a limited character set Therefore, once the mask is applied, it is then possible to check if it is the corresponding key
using ord function (ord (B [0]) - ord (0)) - Stack Overflow So ord(B[0]) - ord('0') is the int 1 when B[0] is the string '1', and it is the int 0 when B[0] is the string '0' In short, it is just a way to convert the string to an int int(B[0]) would have been simpler, but the author is avoiding int, since if you have int then the entire piece of code could be replaced by int(B, 2)
What does the name of the ord () function stand for? The official Python documentation explains ord(c) ord (c): Given a string representing one Unicode character, return an integer representing the Unicode code point of that character For example, ord ('a') returns the integer 97 and ord ('€') (Euro sign) returns 8364 This is the inverse of chr () It does not specify the meaning of ord, google searches are not helpful What's the origin of it?
rust - How do I implement Ord for a struct? - Stack Overflow You can use the Ord implementation on u32 to assist, should you desire it: self value cmp(other value) You should also take into account that Ord is a total ordering If your PartialEq implementation, for example, takes name into consideration, your Ord implementation must also