Aug 19, 2008 · For a person without a comp-sci background, what is a lambda in the world of Computer Science?

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 …

Mar 8, 2011 · Lambda is an anonymous function in Python programming language, instead of bearing a def statement in the front it is simply called and written lambda. def mult2(x):

In Python 2.6, I want to do: f = lambda x: if x==2 print x else raise Exception() f(2) #should print "2" f(3) #should throw an exception This clearly isn't the syntax. Is it possible to perform an if in …

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 …

Invalid comparison. First, you are not passing a lambda function to the filter version, which makes it default to the identity function. When defining if not None in the list comprehension you are …

After reading everything I can find on lambda expressions in Python, I still don't understand how to make it do what I want. Everyone uses the example: lambda x, y : x + y Why do you need to …

Nov 28, 2012 · In Java 8, methods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). There are plenty of examples online with lambdas …

As @unutbu mentioned, the issue is not with the number of lambda functions but rather with the keys in the dict passed to agg() not being in data as columns. OP seems to have tried using …

Per [expr.prim.lambda]/17, only id-expression s referring to entities captured by copy are transformed into a member access on the lambda closure type; id-expression s referring to …