- What is a lambda expression, and when should I use one?
Here is another really good reference which explains very well what are lambda expressions in C++: Microsoft com: Lambda expressions in C++ I especially like how well it explains the parts of a lambda expression, in particular: the capture clause, parameter list, trailing-return-type, and lambda body
- python - List comprehension vs. lambda + filter - Stack Overflow
by_attribute = lambda x: x attribute == value xs = filter(by_attribute , xs) Yes, that's two lines of code instead of one, but you clean filter expression from cumbersome lambda and by naming lambda nicely it literally becomes being read as "filter by attribute" :)
- Is there a way to perform if in pythons lambda? [duplicate]
An easy way to perform an if in lambda is by using list comprehension You can't raise an exception in lambda, but this is a way in Python 3 x to do something close to your example:
- What is the difference between a closure and a lambda?
The closure of a lambda expression is this particular set of symbols defined in the outer context (environment) that give values to the free symbols in this expression, making them non-free anymore It turns an open lambda expression, which still contains some "undefined" free symbols, into a closed one, which doesn't have any free symbols anymore
- python - Syntax behind sorted (key=lambda: . . . ) - Stack Overflow
I don't quite understand the syntax behind the sorted() argument: key=lambda variable: variable[0] Isn't lambda arbitrary? Why is variable stated twice in what looks like a dict?
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