day10 finishing

day10 finishing

Function ---- "tool

Function does not change a single function, it only does one thing -------> package (Interface), make the code more concise

Defined functions

def function name ():

"" "The description of the function" ""

Block

Wherein the function definition: function definition procedure, only detect syntax, the code is not performed

Three forms of function

Empty function

There are function parameters

No-argument function

------ call "function using the function

gues()

Address print (gues) function

Function's return value

A value is returned, but also a set of values ​​(all data types)

return characteristics:

1. return returns a return value, if no value is returned, return None
2. Did not return a default return None
3. return function terminates, the following code is not running, assuming a plurality of return when a return run of
4. return separated by commas, you can return multiple values, return values ​​received in the form of a tuple

Function parameters

There are function parameters: the parameters have their own property

: Followed by a predetermined data type of the parameter, prescriptive

-> the predetermined value followed by a return data type, the convention

Parameter: product-defined function stage, having received argument function, has the meaning described

Location parameter: receiving sequentially from left to right at the arguments

Default parameter: If not specified, the default value, if the value of call when traditional values, using the transmission, the default parameter in a position after the parameter

Argument: call phase product, is passed to a particular parameter values ​​(all data types may be)

Argument position: left to right, to the position of the parameter value passed

Keyword arguments: the name of the parameter according to the parameter values ​​transfer, argument must position in front of the keyword arguments

Vararg

The variable length parameter

* Lt, all pass over all arguments received and stored in the form of a tuple

Variable-length argument

lt = [1,2,3]

* The lt lt element within a passed parameter a is taken out