# DEMO. Загадки --- Чо́му дорівнює `a`? ```python3= a = 1 a == ??? ``` ---- ```python3= a = b = c = d = 2 c == ??? ``` ---- ```python3= a = 1 b = "football" b == ??? ``` ---- ```python3= a = 1 b = 2 football = "soccer" football == ??? ``` ---- ```python3= a = 1 b = 2 b, a = a, b a == ???? ``` ---- ```python3= a = 1 b = 2 football = "" a = 2 b = 1 a == ??? ``` ---- ```python3= c = [] c == ??? ``` ---- ```python3= c = [None, None, None] c[0] = "football" c[1] = "basketball" c[2] = "tennis" c[0] == ??? ``` ---- ```python3= c = [None, None, None] d = {} c[0] = d[0] = "football" c[1] = d[1] = "basketball" c[2] = d[2] = "tennis" d[2] == ??? c[1] == ??? ``` ---- ```python3= c = [] d = { 0: "football", 1: "basketball", 2: "tennis" } c.append(d[0]) c.append(d[1]) c.append(d[2]) c[0] == ??? ``` ---- уважно! ```python3= c = [] d = { 0: "football", 1: "basketball", 2: "tennis" } c.append(d[2]) c.append(d[1]) c.append(d[0]) c[0] == ??? ``` ---- ### Comprehensions ```python3= list1 = ["football", "basketball", "tennis", "MMA"] new_list1 = [x for x in list1] print(new_list1[0]) # Output: football print(new_list1[1]) # Output: basketball new_list1[2] == ??? ``` ---- ```python3= list2 = [99, 88, 77, 66, 55, 44, 33, 22, 11] new_list2 = [bla for bla in list2] print(new_list2[0]) # Output: 99 print(new_list2[1]) # Output: 88 new_list2[3] == ??? ``` ---- ```python3= print() # Output: x = ['N', 'A', 'T', 'A', 'S', 'H', 'A', '!'] natasha = [letter for letter in x] natasha[7] == ??? ``` ---- ```python3= # list4 = [7, 1, 20, 3] print(len(list4)) # Output: 4 new_list4 = [x for x in list4] len(new_list4) == ??? ``` ---- ```python3= # lst = [7, 1, 20, 3] print(len(lst)) # Output: 4 new_lst = [x for x in lst if x > 5] len(new_lst) == ??? ``` ---- ```python3= # natasha = ['N', 'A', 'T', 'A', 'S', 'H', 'A'] print(len(natasha)) # Output: 7 # len([x for x in natasha if x == 'N']) == ?? len([x for x in natasha if x == 'A']) == ??? ```