The definition, characteristics and skills of Python function
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Function characteristics
Hide the details of implementing the function
Reuse code
Improve readability and facilitate debugging
Definition of function
Def function name (formal parameter 1, formal parameter 2,... Parameter n):
Code to run (function body)
Data output by return (return value)
Formal parameters: the format data specified by the function is required for constraints.
Actual parameters: the actual call to the incoming data. Used to pass values.
Return value: the calculation result of the function
After the return statement is executed, the program interrupts execution. The return value None indicates that it does not exist.
The skill of using function
The default value is function (a _ memory b = "usb", c)
Pass parameters in the form of formal parameters: func (name= "zhangsan", age=32) does not have to pass parameters according to the order of formal parameters.
* parameters after representation must be passed by keyword (name,*,age,height) [mixed format]
Sequence pass parameter l = [1 print (* 1)] (calc (* 1)
Dictionary parameter para= {"name": "zhangsan", "age": 32} health_ch (* * para)
The return value contains multiple data
Dict= {"eployer": [{"id": 134, "name": "zhangsan"}],. } name=dict.get ("employer") [0] .get ("name")
Pass parameters in tuple (* tuple)
Random number
Import random import import module
A collection of functions of a module.
Generate a random integer r=random.randint between 1 and 16 (1pc16)
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