序列

>>> a=[0,1,2,3]
>>> a[0:2]
[0, 1]
>>> all(a)
False
>>> all([1,2])
True
>>> any([2,0,0])
True
>>> sum([2,4,])
6
>>> sum([2,'a'])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'str'
>>>