Python中的元组

# 元组
'''
推荐使用括号来指明元组的开始和结束
尽管括号是一个可选选项
明了胜过晦涩，显式优于隐式
'''
zoo = ('python', 'elephant', 'penguin')
print('Number of animals in the zoo is', len(zoo))
new_zoo = 'monkey', 'camel', zoo
print('Number of animals in the zoo is', len(new_zoo))
print('All animals in new zoo are', new_zoo)
print('Animals brought from old zoo are', new_zoo[2])
print('Last animal brought from old zoo is', new_zoo[2][2])
print('Number of animals in the new zoo is',
      len(new_zoo) - 1 + len(new_zoo[2]))