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Bookmark or Share- What is a lambda expression, and when should I use one?A lambda is an unnamed function that is useful (in actual programming, not theory) for short snippets of code that are impossible to reuse and are not worth naming. In C++, the minimal lambda expression looks like: []{} // lambda with no parameters that does nothing [] is the capture list and {} the function body.
- Is there a way to perform "if" in python's lambda? [duplicate]@Glenn Maynard: There's almost no reason to use a lambda, period. Assigning a lambda to a variable -- as a stand-in for def-- is generally a Very Bad Idea (tm). Just use a def so mere mortal programmers can read, interpret, understand and maintain it. –
- What exactly is "lambda" in Python? - Stack OverflowAlso lambda can be used in an expression directly, while def is a statement. def f(x, y): return x + y Would give you almost the same result as. f = lambda x, y: x + y And you can use it directly in an expression. g(5, 6, helper=lambda x, y: x + y) which with def would be less concise
- Understanding lambda in Python and using it to pass multiple argumentsBecause 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)
- python - Syntax behind sorted(key=lambda: ...) - Stack OverflowThe use of lambda creates an anonymous function (which is callable). In the case of sorted the callable only takes one parameters. Python's lambda is pretty simple. It can only do and return one thing really. The syntax of lambda is the word lambda followed by the list of parameter names then a single block of code. The parameter list and code ...
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