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+names = ['Bob', 'John', 'Steve', 'Dave']
+# print(len(names))
+# names += ['Robert']
+# print(names)
+# print(names[:3])
+# print('Bob' in names)
+# names.remove('Bob')
+# names.remove('John')
+# print(names)
+# names.append('Don')
+# print(names)
+# names.extend(['Bob', 'John'])
+# print(names)
+# print(names)
+# names[1] = 'Don'
+# print(names)
+
+# numbers = [1, 2, 3, 4, 5]
+# numbers_squared = [number ** 2 for number in numbers]
+# print(numbers_squared)
+
+# numbers_two = numbers.copy()
+# numbers_two.append(6)
+# print(numbers, numbers_two)
+
+# Exercise
+namelist = ['wub_wub', 'RubyPinch', 'go|dfish', 'Nitori']
+namelist.append('pb122')
+if 'pb122' in namelist:
+    print("Now I know pb122!")
+
+# print("Hello!")
+# name = input("Enter your name: ")
+# print("Your name is %s." % name)
+
+namelist = ['wub_wub', 'RubyPinch', 'go|dfish', 'Nitori']
+namelist.extend('theelous3')
+if input("Enter your name: ") in namelist:
+    print("I know you!")
+else:
+    print("I don't know you.")