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.")