Swap two variables

(1) `swap()`
def main(): a = 3 b = 5 a, b = b, a print(a) # 5 print(b) # 3 li = [2, 5, 6, 9] li[0], li[1] = li[1], li[0] print(li) # [5, 2, 6, 9]	import std.stdio; import std.algorithm; // swap() void main() { int a = 3; int b = 5; swap(a, b); writeln(a); // 5 writeln(b); // 3 auto li = [2, 5, 6, 9]; swap(li[0], li[1]); writeln(li); // [5, 2, 6, 9] }

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