How do I get the number of elements in a list in Python?
How do I get the number of elements in the list items? items = [“apple”, “orange”, “banana”] # There are 3 items. 1 11
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How do I sort a list of dictionaries by a value of the dictionary?
I have a list of dictionaries and want each item to be sorted by a specific value. Take into consideration the list: [{‘name’:’Homer’, ‘age’:39}, {‘name’:’Bart’, ‘age’:10}] When sorted by name, it should become: [{‘name’:’Bart’, ‘age’:10}, {‘name’:’Homer’, ‘age’:39}] 1 18
How do I get the last element of a list?
How do I get the last element of a list? 2 22
How do you split a list into evenly sized chunks?
How do I split a list of arbitrary length into equal sized chunks? Related question: What is the most “pythonic” way to iterate over a list in chunks? 70 70 Here’s a generator that yields the chunks you want: def chunks(lst, n): “””Yield successive n-sized chunks from lst.””” for i in range(0, len(lst), n): yield … Read more
How to initialize List object in Java?
If you check the API for List you’ll notice it says: Being an interface means it cannot be instantiated (no new List() is possible). If you check that link, you’ll find some classes that implement List: All Known Implementing Classes: AbstractList, AbstractSequentialList, ArrayList, AttributeList, CopyOnWriteArrayList, LinkedList, RoleList, RoleUnresolvedList, Stack, Vector Some of those can be instantiated (the ones that are not defined as abstract class). Use their links to know more about them, I.E: to … Read more
Is there a concurrent List in Java’s JDK?
Is there a concurrent List in Java’s JDK?
How do I clone a list so that it doesn’t change unexpectedly after assignment?
While using new_list = my_list, any modifications to new_list changes my_list every time. Why is this, and how can I clone or copy the list to prevent it? 2 21
“Instantiating” a List in Java? [duplicate]
In Java, List is an interface. That is, it cannot be instantiated directly. Instead you can use ArrayList which is an implementation of that interface that uses an array as its backing store (hence the name). Since ArrayList is a kind of List, you can easily upcast it: List<T> mylist = new ArrayList<T>(); This is in contrast with .NET, where, since version 2.0, List<T> is the … Read more
What is the difference between Python’s list methods append and extend?
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. What’s the difference between the list methods append() and extend()? 20
How do I check if a list is empty?
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. For example, if passed the following: a = [] How do I check to see if a is empty? 2 27