aws lambda python 3

1. anonymous function Defined by the lambda keyword , the result of the statement is the return value, as shown below: In [O]: def sho_function (a): ...: Return a**2 ...: in [(a) : equiv = lambda a:a**2 in [% ]: print (eq UIV (3)) # 9 2, the function of the parameters In Python, function parameters work very

One or three-dollar operationFormat: Object = value 1 if condition else value 2 assigns value 1 to object when condition is set, and vice versa assigns value 2 to object>>> name = 1 if True else 2>>> name1>>> name = 1 if False else 2>>> name2General formula: Code 1 if condition else code 2 when the condition is set to execute if the preceding code 1, is not established then the code is executed 2Second, lambda expressionFormat: function name =

item order in sequence, if there is starting_ Value, which can also be called as an initial value, for example, can be used to sum the list: >>> def add (x, y): return x + y >>> Reduce (add, range (1, ) 55 (note: 1+2+3+4+5+6+7+8+9+10) >>> Reduce (add, range (1, one),) 75 (Note: 1+2+3+4+5+6+7 +8+9+10+20) Lambda: This is a funny syntax for

Run error : _pickle. Picklingerror:can ' t pickle The code is as follows:1 #!/usr/bin/env Python32 #-*-coding:utf-8-*-3 4 Importrandom, time, queue5 fromMultiprocessing.managersImportBasemanager6 7 #queue for sending tasks:8Task_queue =queue. Queue ()9 #queue to receive results:TenResult_queue =queue. Queue () One A #QueueManager inherited from Basemanager: - classQueueManager (basemanager): - Pass the - #register two queues on the network, the

Special syntax in Python: filter, map, reduce, lambda introduction, pythonlambda Filter (function, sequence ):Execute function (item) in sequence for items in sequence, and combine items with the execution result of True into a List/String/Tuple (depending on the sequence type) to return:Copy codeThe Code is as follows:>>> Def f (x): return x % 2! = 0 and x % 3!

difference between the two>>> help (List.sort)-on Method_descriptor:sort (...) L.sort (Key=none, Reverse=false), None--stable sort *in place*>>> help (sorted) to built-in/, *, Key=none, reverse=False) from inch ascending order. and the in descending order.2. In addition to using operator, we can also use lambda>>> L.sort (key=Lambda x:x[1])>>> l[('C', 1 ), ('b', 2), ('a',

Lambda functions, similar to normal functions, are used the same way and can be used to define simple functions. Introduced: >>> def f (x): ... Return x*2 ... >>> F (3) 6>>> g = lambda x:x*2 >>> g (3) 6>>> (lambda x:x*2) (

Python anonymous functions lambda and switch implementation, pythonlambda 1. lambda syntax is similar to es6 arrow Function >>> show=lambda x,y: x * y>>> show( 10, 20 )200 2. Recursive factorial >>> def fab( n ):... if n == 0:... return 1... else:... return n * fab( n - 1)... >>> fab(

. The filter () function includes two parameters, function, and list. That is, the function filters the items in the list parameter based on whether the result returned by a function parameter is true, and then returns a new list. In simple terms, the filter () function is equivalent to the following code: c = [B for b in A1 if B > 2] print C The second knowledge point is the lambda () function Py