language agnostic - What is a lambda (function)? - Stack Overflow
Aug 19, 2008 · A Lambda Function, or a Small Anonymous Function, is a self-contained block of functionality that can be passed around and used in your code. Lambda has different names in different programming languages – Lambda in Python and Kotlin , Closure in Swift , or Block in C and Objective-C .
What is a lambda expression, and when should I use one?
Oct 2, 2011 · A lambda expression, sometimes also referred to as a lambda function or (strictly speaking incorrectly, but colloquially) as a lambda, is a simplified notation for defining and using an anonymous function object. Instead of defining a named class with an operator(), later making an object of that class, and finally invoking it, we can use a ...
python - Why use lambda functions? - Stack Overflow
@J.F. Sebastian, yes, "operator.itemgetter" ,and hundreds of other short functions one would have to know by heart, each to one specific use -- or use lambda, where one can create a generic expression in place, without having to recall exactly which short function does that one job.
What exactly is "lambda" in Python? - Stack Overflow
Mar 8, 2011 · lambda is an anonymous function, usually used for something quick that needs computing. Example (This is used in a LexYacc command parser): assign_command = lambda dictionary, command: lambda command_function: dictionary.setdefault(command, command_function) This is a decorator.
Understanding lambda in Python and using it to pass multiple …
Because a lambda is (conceptually) the same as a function, just written inline. Your example is equivalent to . def f(x, y) : return x + y just without binding it to a name like f. Also how do you make it return multiple arguments? The same way like with a function. Preferably, you return a tuple: lambda x, y: (x+y, x-y)
How to copy or duplicate an AWS Lambda function
May 24, 2018 · The do_duplicate_function.py Python 3 function code below can be deployed to Lambda, or be run locally, to duplicate a function in your AWS account. To use it, configure a test event in the AWS console or otherwise invoke the function with event data containing at least:
function - What is the difference between a 'closure' and a …
Jan 6, 2023 · Lambda is an anonymous function definition that is not (necessarily) bound to an identifier. "Anonymous functions originate in the work of Alonzo Church in his invention of the lambda calculus, in which all functions are anonymous" - Wikipedia. Closure is the lambda function implementation.
python - Syntax behind sorted(key=lambda: ...) - Stack Overflow
That lambda function can be thought of as a pointer that points to the values we need to sort by, whether its a pointer mapping a value to its boolean transformed by the lambda function, or if its a particular element in a nested list, tuple, dict, etc., again determined by the lambda function.
Apache spark and python lambda - Stack Overflow
Jul 4, 2014 · So to explain it in your example. file = spark.textFile("hdfs://...") // open text file each element of the RDD is one line of the file counts = file.flatMap(lambda line: line.split(" ")) //flatMap is needed here to return every word (separated by a space) in the line as an Array .map(lambda word: (word, 1)) //map each word to a value of 1 so they can be summed …
python - List comprehension vs. lambda + filter - Stack Overflow
I find the list comprehension much clearer than filter+lambda, but use whichever you find easier. There are two things that may slow down your use of filter. The first is the function call overhead: as soon as you use a Python function (whether created by def or lambda) it is likely that filter will be slower than the list comprehension. It ...