In C#, with LINQ, if I have en enumeration enumerable, I can do: // a: Does the enumerable contain an item that satisfies the lambda? bool contains = enumerable.Any(lambda); // b: How many items satisfy the lambda? int count = enumerable.Count(lambda); // c: Return an enumerable that contains only distinct elements according to my custom comparer var distinct = enumerable.Distinct(comparer); // d: Return the first element that satisfies the lambda, or throws an exception if none var element = enumerable.First(lambda); // e: Returns an enumerable containing all the elements except those // that are also in 'other', equality being defined by my comparer var except = enumerable.Except(other, comparer); I hear that Python has a more concise syntax than C# (and is therefore more productive), so how do I achieve the same with an iterable in Python, with the same amount of code, or less? Note: I don't want to materialize the iterable into a list if I don't have to (Any, Count, First). Continue reading...