Difference between union() and update() in sets, and others? Question: Python sets have these methods: s.union(t) s | t new set with elements from both s and t s.update(t) s |= t return set s with elements added from t Likewise, there’s also these: s.intersection_update(t) s &= t return set s keeping only elements also …
Union of dict objects in Python Question: How do you calculate the union of two dict objects in Python, where a (key, value) pair is present in the result iff key is in either dict (unless there are duplicates)? For example, the union of {‘a’ : 0, ‘b’ : 1} and {‘c’ : 2} is …
What does `**` mean in the expression `dict(d1, **d2)`? Question: I am intrigued by the following python expression: d3 = dict(d1, **d2) The task is to merge 2 dictionaries into a third one, and the above expression accomplishes the task just fine. I am interested in the ** operator and what exactly is it doing …
