数据库像MS Access的PHP(db like ms access for php)

 编辑：我认为grouper在这个解决方案中是过度的，请看@Haidro的解决方案https://stackoverflow.com/a/16078696/1219006 
 
 
 使用itertools的石斑鱼配方 
 
 我假设b是一个开头的字符串，因为将数字设置得那么大会浪费内存。 
 
from itertools import izip_longest
from operator import mul

def grouper(n, iterable, fillvalue=None):
    "Collect data into fixed-length chunks or blocks"
    # grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

for g in grouper(5, b, fillvalue=''):
    # And to work out the product of the digits
    num = ''.join(g)
    prod = reduce(mul, map(int, num))

Edit: I believe that grouper is overkill in this solution, look at the solution by @Haidro https://stackoverflow.com/a/16078696/1219006
 
 
Using the grouper recipe from itertools
 
I'm assuming b is a string to begin with because it would be a crazy waste of memory to make a number that big.
 
from itertools import izip_longest
from operator import mul

def grouper(n, iterable, fillvalue=None):
    "Collect data into fixed-length chunks or blocks"
    # grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx
    args = [iter(iterable)] * n
    return izip_longest(fillvalue=fillvalue, *args)

for g in grouper(5, b, fillvalue=''):
    # And to work out the product of the digits
    num = ''.join(g)
    prod = reduce(mul, map(int, num))