You’re missing comma (,) inbetween: >>> ((1,2) (2,3)) Traceback (most recent call last): File “<stdin>”, line 1, in <module> TypeError: ‘tuple’ object is not callable Put comma: >>> ((1,2), (2,3)) ((1, 2), (2, 3))
At first glance, it appears that x should always equal y, because two sets constructed from the same elements are always equal: >>> x = set([1, “a”, “b”, “c”, “z”, “f”]) >>> y = set([“a”, “b”, “c”, “z”, “f”, 1]) >>> x {1, ‘z’, ‘a’, ‘b’, ‘c’, ‘f’} >>> y {1, ‘z’, ‘a’, ‘b’, ‘c’, … Read more
All the expressions to the right of the assignment operator are evaluated before any of the assignments are made. From the Python tutorial: First steps towards programming: The first line contains a multiple assignment: the variables a and b simultaneously get the new values 0 and 1. On the last line this is used again, … Read more
So you want the difference between two lists of items. first_list = [[‘Test.doc’, ‘1a1a1a’, 1111], [‘Test2.doc’, ‘2b2b2b’, 2222], [‘Test3.doc’, ‘3c3c3c’, 3333]] secnd_list = [[‘Test.doc’, ‘1a1a1a’, 1111], [‘Test2.doc’, ‘2b2b2b’, 2222], [‘Test3.doc’, ‘8p8p8p’, 9999], [‘Test4.doc’, ‘4d4d4d’, 4444]] First I’d turn each list of lists into a list of tuples, so as tuples are hashable (lists are not) … Read more
In Python the _ is often used as an ignored placeholder. (path, _) = self._treeView.get_cursor() You could also avoid unpacking as a tuple is indexable. def get_selected_index(self): return self._treeView.get_cursor()[0][0]
It’s very easy: not all(t1) returns False only if all values in t1 are non-empty/nonzero and not None. all short-circuits, so it only has to check the elements up to the first empty one, which makes it very fast.
Swift 4 If your tuples is (Hashable, String) you can use: let array = [(“key1”, “value1”), (“key2”, “value2”), (“key3”, “value3”)] let dictionary = array.reduce(into: [:]) { $0[$1.0] = $1.1 } print(dictionary) // [“key1”: “value1”, “key2”: “value2”, “key3”: “value3”]
In C# 7.0 (Visual Studio 2017) there is a new option to do that: (string first, string middle, string last) LookupName(long id)
Vector: Ordered collection of objects of the same type. Set: Unordered collection of objects, possibly of the same type or possibly different depending on the collection type and language. Any given object can only appear once. Tuple: Ordered collection of objects of different types.
it’s typically referred to as flattening a nested structure. >>> tupleOfTuples = ((1, 2), (3, 4), (5,)) >>> [element for tupl in tupleOfTuples for element in tupl] [1, 2, 3, 4, 5] Just to demonstrate efficiency: >>> import timeit >>> it = lambda: list(chain(*tupleOfTuples)) >>> timeit.timeit(it) 2.1475738355700913 >>> lc = lambda: [element for tupl in … Read more