Python fundemental, fundemental

Python fundemental, fundemental

1. function parameters and local variables

The Parameter Variable allocates memory units only when called. The allocated memory units are immediately released at the end of the call. Therefore, the parameter is valid only within the function. After the function call ends, you cannot use this variable after the main function is called.

Real parameters can be constants, variables, expressions, functions, etc. No matter what type of real parameters are, they must have a definite value during function calling, in order to pass these values to the form parameter. Therefore, values should be pre-assigned, input, and other methods to obtain a definite value for the parameter.