How to call a custom function in python

In python, if you want to call a custom function, you must declare it first and then call it. When using a function, as long as you pass the necessary parameters to the function in the form of the function definition, you can call the function to complete the corresponding function or obtain the processing result returned by the function.

(1) Declaring a function

Use def in python to declare a function. The complete function consists of the function name, parameters And it consists of function implementation statements (function bodies).

In function declarations, indentation should also be used to indicate that statements belong to the function body.

If the function has a return value, you need to use the return statement in the function to return the calculation result. The general form of declaring the function is as follows:

def (parameter list):

                                                                                                                                                                                        return. Functions that have no return value after return and no return statement will return None.

Example: To implement the function of finding the sum of all numbers in a tuple, the parameter T is the tuple required to be summed, and the result is the accumulator for the sum of the tuples. Finally, the function uses return to add the accumulated result to result. return. The function declaration code is as follows:

def tpl_sum(T):
    result=0
    for i in T:
        result+=i
    return result

When declaring a function in Python, there is no need to declare the return value type of the function, nor the types of parameters.

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(2) Calling functions

Calling custom functions and built-in The difference between functions is that the function needs to be defined first. Example: tpl_sum() function definition and call

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