python lambda function

--std=c++11#includeIn the above example, the 3rd parameter of Show_x_num is a traditional function pointer, and we can use a lambda expression without capture ([Captrue]) as the 3rd parameter of the Show_x_num ( section Lines 31 and 34), but using a lambda with capture will compile an error (line 39 ).If you want to use a captured

be processed,initval is the initial value 2. Code1 array=[1,2,3,4,5,6,7]2Lambda x,y:x+y3 ans2= reduce (add , array,0)4print ans3. Function prototypes1 defreduce (function,array,initval):2TMP =list (array)3 ifInitval isNone:4Ans = list.pop (0)#take the first element of the list and delete5 Else:6Ans =Initval7 foreachinchtmp:8Ans =function (Ans,

One or three-tuple operator# when the condition is met 1 o'clock, the res= value is 1; otherwise res= value 2 if Else value 2To illustrate:res=10# Simple If Else statement if abs (res) >0: = 10**2else: Res =0# implemented with ternary operators above if elseifelse 0Second, lambda expression# to define a simple function def func (x, y): return x+y#lambda

意结构')Print(Sumtree (L))##间接函数调用defEcho (message):Print(message)defIndirect (Func,args): func (args) indirect (echo,'Shixingwen') Schedule1=[(Echo,'spam! '), (Echo,'ham!') ] for(Func,args)inchSchedule1:func (args)Print('# #间接调用函数')Print(Echo.__name__)## #python function AnnotationsdefFunc (A:'spam', B: (1,3), c:float):returnA + B +CPrint('# #函数注释')Print(Func-)) Zhushi= Func.__annotations__ Print(Zhushi,'\

If else can be represented by a simple ternary operatorIf 1 = = 1: name = ' Wupeiqi ' else: name = ' Alex '--》name = ' Wupeiqi ' if 1 = = 1 Else ' Alex 'Lambda can also be used to simplify expressions for functions# ###################### normal function ####################### definition function (normal way) def func (Arg): return arg + 1 # Execute

Lambda comes from the concept of functional programming and is also a feature of modern language programming.First look at the basic use of lambda:1 [capture] (params) opt->return {body;}Where capture is a capturing list (that is, a free variable in a closure): [] do not intercept any variables [] intercepts all variables in the outer scope and uses them as references in the body of the

Lambda is just an expression, and the function body is much simpler than def.The body of a lambda is an expression, not a block of code. Only a finite amount of logic can be encapsulated in a lambda expression.A lambda expression acts as a

Java developers should be able to java.lang.runnable,java.util.comparator,java.util.concurrent.callable And so on interface will not feel strange. They all have a single, abstract approach. For such an interface, we usually call the single abstract method interface (SAM,one abstract methodsInterface). You should always use the following code snippet beforepublic class Inneranonymousclasssample {public static void Main (string[] args) { new Thread (new Runnable () { @Overrid

example, you can use to sum a list:defAdd (x, y):returnX +yPrintReduce (Add, range (1, 11)) Note:1+2+3+4+5+6+7+8+9+10reduce (Add, range (1, 11), 20) Note:1+2+3+4+5+6+7+8+9+10+20 iv.Lambda This is Python support an interesting syntax that allows you to quickly define a single line of the smallest function, similar to the C language of the macro, these functions, called