one_two_three = 123 x = 1 #del one_two_three def a(): one_two_three = 10 x = 9 def b(): global x x = x + 1 print(x) b() a() print(x) x = [1,2,3,4,5,6] x.remove(2) print(id(x)) x.clear() print(id(x)) x = [] print(id(x)) x = [6,1,2,3,4,5] x.sort() y = sorted(x) print(x,y) x = 6,1,2,3,4,5 x = list(x) x.sort() x = tuple(x) y = sorted(list(x)) print(x,y) d = {'a' : 1, 'b' : 2} print(d.keys()) print(d.values()) print(d.items()) x = [1,2,3,4] print(0 in x) d = {"a" : 1, "b" : 2} print(1 in d.values()) try: x = 1 y = x + 1 if y == 2: raise except: print("y is 2") ''' assert expression => if not expression: raise AssertionError asset exp1, exp2 => if not exp1: raise AssertionError(exp2) ''' def a(): print("function a") return False try: x = 1 y = x + 1 if y == 2: assert a(), 'assertion error' except AssertionError as msg: print(msg) #https://glot.io/snippets/hhrnbqy42s