aws lambda function python

Yield (saves the execution state of the function)A function with yield is a generator, which, unlike a normal function, generates a generator that looks like a function call, but does not execute any function code until it calls next () (which is automatically called next ()

Recently in the analysis of the data, with some simple filtering, but also learned, lambda and startwith some usage, write a memo below, first understand lambda. This is a small usage of a similar function, which can be used in conjunction with the filter:>>> Xiaoluo = lambda x,y:x+y>>> print Xiaoluo ($) 3>>> print Xia

One, lambda expression1>>>defAdd (x, y):#Define an addition function2 returnX+y#returns the added value of two parameters3 4>>> z=f (3,4) 5>>>Print(z)67#Call the addition function to return 77>>>Lambdax,y:x+y8Lambda> at 0x0000020f385b86a8>9 #you can see that the lambda is a function class objectTen>>

Map function: Prototype: Map (function, sequence), which maps a list to another list,How to use:def f (x):Return x**2L = Range (1,10)Map (f,l)OUT[3]: [1, 4, 9, 16, 25, 36, 49, 64, 81] Reduce function Prototype: reduce (function, sequence, startvalue), which is to summarize a list as an output,How to

Map function: Prototype: Map (function, sequence), which maps a list to another list, How to use: def f (x): Return x**2 L = Range (1,10) Map (f,l) OUT[3]: [1, 4, 9, 16, 25, 36, 49, 64, 81] Reduce function Prototype: reduce (function, sequence, startvalue), which is to summarize a list as an outpu

Lambda expression, this bird thing is to define a function in one line of statements. Http://woodpecker.org.cn/diveintopython/power_of_introspection/lambda_functions.html >>> def f (x): ... Return x*2 ... >>> F (3) 6 >>> g = lambda x:x*2 >>> g (3) 6 >>> (lambda x:x*2) ( 3) # 6 The List is the most frequen

/tuple/string and an initial value, and the return value is numeric.#Coding=utf-8" "Created on 2016-12-14@author:jennifer Project: Usage of filter, map, reduce, lambda in Python" "#1.LAMBDA usage, before the colon is the argument, after the colon is the expression, the return value, the simplest functionPrint[(LambdaX:X*X) (x) forXinchRange (11)]#results: [0, 1,

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,'\

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