Jul 18, 2022 · Note: Since set elements must be hashable, and lists are considered mutable, you cannot add a list to a set. You also cannot add other sets to a set. You can however, add the elements from lists and sets as demonstrated with the .update method.

Jul 18, 2022 · a | b, or a.union(b), is the union of the two sets — i.e., a new set with all values found in either set. This is a class of operations called "set operations", which Python set types are equipped with.

Mar 4, 2015 · I guess no one mentioned about the good resource from Hackerrank. I'd like to paste how Hackerrank mentions the difference between update and add for set in python. Sets are unordered bag of unique values. A single set contains values of any immutable data type. CREATING SET

Jul 18, 2022 · Both the |= operator and set.update() method apply that operation in-place and are effectively synonymous. So, set_a |= set_b could be considered syntactic sugar for both set_a.update(set_b) and set_a = set_a | set_b (except that in the latter case, the same set_a object is reused rather than reassigned). </ahem> –

Jun 21, 2009 · @hegash the d[key]=val syntax as it is shorter and can handle any object as key (as long it is hashable), and only sets one value, whereas the .update(key1=val1, key2=val2) is nicer if you want to set multiple values at the same time, as long as the keys are strings (since kwargs are converted to strings).

How to add() runtime input in a set in python? 1. Adding items in set (Python) Hot Network Questions

Oct 28, 2010 · Note that the representation is just e.g. {1, 2, 3} in Python 3 whereas it was set([1, 2, 3]) in Python 2. – Resigned June 2023 Commented Nov 26, 2017 at 0:04

I'm trying to make a set of sets in Python. I can't figure out how to do it. Starting with the empty set xx: xx = set([]) # Now we have some other set, for example elements = set([2,3,4]) xx.add

os.environ behaves like a python dictionary, so all the common dictionary operations can be performed. In addition to the get and set operations mentioned in the other answers, we can also simply check if a key exists. The keys and values should be stored as strings. Python 3. For python 3, dictionaries use the in keyword instead of has_key

Jan 19, 2011 · How do you append the elements of a set to a list in Python in the most succinct way? >>> a = [1,2] &gt;&gt;&gt; b = set([3,4]) &gt;&gt;&gt; a.append(list(b)) &gt;&gt ...