Python Learning notes-inline functions, closures, anonymous functions, higher-order function map, higher-order function filter, high-order function reduce

1 #------------------------------inline Function------------------------------2 #an inline function is a function defined inside a function .3 #instance One4 Print("#------------------------------inline function------------------------------")5 defFunoutone ():6x = 57     defFunin ():8x = 39         Print("My funoutone in funin x =", X)Ten     Print("My Funoutone x =", X) One     returnFunin A  - #Calling Methods - Funoutone () () the  - #Example Two - deffunouttwo (): -x = 5 +     defFunin (): -x = 6 +         Print("My funouttwo in funin x =", X) A     Print("My funouttwo x =", X) at     returnFunin () -  - #Calling Methods - Funouttwo () -  - #Example two: How to refer to variables inside a function, using nonlocal in defFunoutthree (): -x = 10 toy = 20 +     defFunin (): - nonlocal x thex = 18 *y = 38 $         Print("My funoutthree in funin x ="X"y =", y)Panax Notoginseng Funin () -     Print("My Funoutthree x ="X"y =", y) the     returnNone +  A Funoutthree () the  + #example four: observing their invocation - deffunoutfour (): $     defFunin (): $         Print("Funin is called after!") -     Print("Funoutfour is called first!") -     returnFunin the  - Funoutfour () ()Wuyi Print("#--------------------------------------------------------------------") the #-------------------------------------------------------------------- - #closure characteristics of------------------------embedded functions-------------------------- Wu Print("#------------------------closure characteristics of inline functions--------------------------") - #when assigning an inline function to a variable, if the variable is not destroyed, the parameters inside the function are not recycled About defClosurefun (): $x = 1 -     defFunin (): - nonlocal x -x + = 1 A         returnx +     returnFunin the  -A =Closurefun () $b =Closurefun () thec =Closurefun () the  the Print("A,", A ()) the Print("A,", A ()) - Print("A,", A ()) in Print("B,", B ()) the Print("B,", B ()) the Print("C,", C ()) About #conclusion, different variables, pointing to the object are irrelevant!  the      the Print("#--------------------------------------------------------------------") the #-------------------------------------------------------------------- + #------------------------anonymous function, higher order function-------------------------- - Print("#------------------------anonymous function, higher order function--------------------------") the #anonymous functions and higher order functions map (map) filter (filter) reduce (inductive)Bayi  the #anonymous functions: Anonymous functions can increase the readability of code, thin code the #Example One: -A =LambdaX, Y:x +y - Print("Anonymous functions:", A (5,8)) the  the #Example Two: theb =Lambda: [x * x forXinchRange (10)] theList1 =B () - Print("Anonymous functions:", List1) the  the #higher-order function map (map): It is the fact that each value in the sequence is passed as a parameter to the function and another sequence is returned the #Example One:94A = Map (LambdaX:X * 2,[x forXinchRange (10)]) the Print("Higher order function map:", List (a)) the  the #Example Two:98b = Map (LambdaX:X * * 3,[x forXinchRange (10,21)]) About Print("Higher order function map:", list (b)) - 101 #Higher order function filter (filter): If one of the values in the sequence is converted to a bool value and the value is false, it will be excluded from the sequence102 #Example One:103A = Filter (LambdaX:x% 2, (1,2,3,4,5,6,7,8))104 Print("Higher order function filter", List (a)) the #Example Two:106b = Filter (LambdaX:x% 2 = = 0, (1,2,3,4,5,6,7,8))107 Print("Higher order function filter", list (b))108 109 #High- order function reduce: The value of a sequence is passed as a parameter to the function, and finally returned as a value! Before you call the reduce function, remember to import the package the  fromFunctoolsImportReduce111 #Example One: theA = reduce (LambdaX, Y:x + y, (x forXinchRange (6)))113 Print("High- order function reduce", a) the  the #Example Two: theb = Reduce (LambdaX, Y:x * y, (1,2,3,4,5))117 Print("High- order function reduce", B)118 119 Print("#--------------------------------------------------------------------") - #--------------------------------------------------------------------

Python Learning notes-inline functions, closures, anonymous functions, higher-order function map, higher-order function filter, high-order function reduce