From Python 3 documentation (the same holds for python 2.7): Curly braces or the set() function can be used to create sets. Note: to create an empty set you have to use set(), not {}; the latter …

TypeError: unhashable type: 'set' Is it possible to have a set of sets in Python? I am dealing with a large collection of sets and I want to be able to not have to deal duplicate sets (a set B of sets …

Jul 18, 2022 · The OP asked about "appending" to a set, which is more correctly described as "adding" to a set or "updating" a set. Here you are "creating" a set from a union, not adding to …

Jun 13, 2012 · As of Python 3, you can explicitly declare variables by type. For instance, to declare an integer one can do it as follows: x: int = 3 or: def f(x: int): return x see this question …

Dec 19, 2015 · There were no set literals in Python 2, historically curly braces were only used for dictionaries. Sets could be produced from lists (or any iterables): set([1, 2, 3]) set([i for i in …

A set literal is just a tuple of values in curly braces: x = {2, 3, 5, 7} So, you can create an empty set with empty tuple of values in curly braces: x = {*()} Still, just because you can, doesn't …

Oct 14, 2010 · Edit: Python 3.5 introduced type hints which introduced a way to specify the type of a variable. This answer was written before this feature became available. There is no way to …

Apr 15, 2017 · Actually, set literals have been backported to Python 2.7, so they are not only available strictly in Python 3. – Jim Brissom Commented May 25, 2011 at 20:56

Jul 11, 2016 · If you declare a variable outside the brackets, it become global (accessible to all functions and other brackets). If you declare a variable inside the brackets, it become local …

Oct 3, 2009 · A couple of contributions suggested that arrays in python are represented by lists. This is incorrect. Python has an independent implementation of array() in the standard library …