A, python function classification:
1. 2. The built-in function to third standard library function 3. Function 4. User-defined functions
Function definitions and calls
Function must be defined before using the function execution def, creates a function object bound to the function and variable names, function definition syntax is as follows:
def function name (parameter list):
// function from zero to a plurality of pieces of executable statements
[return [Return value]]
Example:
Second, the return value:
return Return Value Points:
1. If the function body comprises a return statement, the function execution ends and returns a value;
2. If the function body comprises a return statement, then the value returned None
3. To return to a plurality of return value, use the list, tuples, dictionaries, a plurality of set values saved.
