Python2和Python3的不同

reduce
在python3中不是内置函数，需要导入functools

>>> a = ['1','2','3']
>>> b = list(map(int,a))
>>> import functools
>>> print(functools.reduce(lambda x,y: x+y,b))
6

Python2中

>>> a = ['1','2','3']
>>> b = map(int,a)
>>> print(reduce(lambda x,y: x+y,b))
6

range
在python3中

>>> print(range(1,5))
range(1, 5)
>>> print(list(range(1,5)))
[1, 2, 3, 4]

Python2中

>>> print(range(1,5))
[1, 2, 3, 4]