yield You can use a generator for an elegant solution. At each iteration, yield twice—once with the original element, and once with the element with the added suffix. The generator will need to be exhausted; that can be done by tacking on a list call at the end. def transform(l): for i, x in enumerate(l, … Read more
The very definition of a list comprehension is to produce one list object. Your 2 list objects are of different lengths even; you’d have to use side-effects to achieve what you want. Don’t use list comprehensions here. Just use an ordinary loop: listOfA, listOfB = [], [] for idx, x in enumerate(s): target = listOfA … Read more
When someone writes code like this, he/she is trying to follow a basic OO design principle which says – Program to an interface, not to a concrete implementation I have explained this principle in one of my blog posts. Look in the Class Inheritance VS Interface Inheritance section. To summarize the post, when you use … Read more
In brief: A list is an ordered list of objects, where the same object may well appear more than once. For example: [1, 7, 1, 3, 1, 1, 1, 5]. It makes sense to talk about the “third element” in a list. You can add an element anywhere in the list, change an element anywhere … Read more
Use the any() function. This returns True if any list within the list is not empty. alist = [[],[]] if not any(alist): print(“Empty list!”) >> Empty list! see: https://www.programiz.com/python-programming/methods/built-in/any
Try this: List<Type> types = new List<Type>() { typeof(Button), typeof(TextBox) }; The typeof() operator is used to return the System.Type of a type. For object instances you can call the GetType() method inherited from Object.
List(Of String) will handle that, mostly – though you need to either use AddRange to add a collection of items, or Add to add one at a time: lstOfString.Add(String1) lstOfString.Add(String2) lstOfString.Add(String3) lstOfString.Add(String4) If you’re adding known values, as you show, a good option is to use something like: Dim inputs() As String = { “some … Read more
You could just use a regular sort, and then bisect the list at 0: >>> lst [1, -2, 10, -12, -4, -5, 9, 2] >>> from bisect import bisect >>> lst.sort() >>> i = bisect(lst, 0) # use `bisect_left` instead if you want zeroes first >>> lst[i:] + lst[:i] [1, 2, 9, 10, -12, -5, … Read more
Say you have a bunch of students with names and student IDs. If you put them in a List, the only way to find the student with student_id = 300 is to look at each element of the list, one at a time, until you find the right student. With a Map, you associate each … Read more
Using Reflector for .NET we can see: public int IndexOf(T item) { return Array.IndexOf<T>(this._items, item, 0, this._size); } public static int IndexOf<T>(T[] array, T value, int startIndex, int count) { return EqualityComparer<T>.Default.IndexOf(array, value, startIndex, count); } internal virtual int IndexOf(T[] array, T value, int startIndex, int count) { int num = startIndex + count; for … Read more