aggiunge esercizio 23

lab20.py

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+hat_list = [1, 2, 3, 4, 5]
+
+# passo 1
+
+hat_list[2] = int(input("Inserisci il nuovo numero centrale: "))
+
+# passo 2
+
+del hat_list[-1]
+
+# passo 3
+
+print("Lunghezza: ",len(hat_list))
+
+print(hat_list)

lab21.py

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+# passo 1
+
+beatles = []
+
+print("Passo 1:", beatles)
+
+# passo 2
+
+beatles.append("John")
+beatles.append("Lennon")
+beatles.append("Paul")
+beatles.append("McCartney")
+beatles.append("Geaorge Harrison")
+
+print("passo 2:", beatles)
+
+# passo 3
+
+for i in range(2):
+    j = input("Inserici un altro membro: ")
+    beatles.append(j)
+
+print("Passo 3", beatles)
+
+# passo 4
+
+for i in range(2):
+    del beatles[-1]
+
+print("Passo 4", beatles)
+
+# passo 5
+
+beatles.insert(0, "Ringo Starr")
+
+print("Passo 5", beatles)

lab22.py

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+my_list = [1, 2, 4, 4, 1, 4, 2, 6, 2, 9]
+
+unique_list = []
+
+for number in my_list:
+    if number not in unique_list:
+        unique_list.append(number)
+
+my_list = unique_list
+
+print("The list with unique elements only:")
+print(my_list)

lab23.py

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+def is_year_leap(year):
+    if year % 4 == 0:
+        return True
+    else:
+        return False
+
+test_data = [1901, 2000, 2016, 1987]
+
+test_result = [False, True, True, False]
+
+for i in range(len(test_data)):
+    yr = test_data[i]
+    print(yr, "->", end="")
+    resutl = is_year_leap(yr)
+    
+    if resutl == test_result[i]:
+        print("OK")
+    else:
+        print("Failed")