Python NameError: name 'b' is not defined - Solution and Explanation

This error message is indicating that the variable 'b' is not defined before it is being used in the code. To fix this error, you need to define the variable 'b' before using it. Here's an example:\n\npython\na = 5\nb = 10\nc = b % a\nprint(c)\n\n\nIn this example, both 'a' and 'b' are defined before performing the modulo operation, so the error should be resolved.