python - 如何在 1 行中为迭代器更改 2

Question

我有这两个迭代器：

for i in range(len(list_of_routes)):#
    for b in range(len(lines)):         
        r = lines[b].find(list_of_routes[i])

如何简化？

附言

例如：

list_of_routes = [route1, route2, route3]
lines = [info for route1, info for route2, info for route3, info for route2]

标签： pythonloops

Answer 1

您可以使用itertools.product：

from itertools import product

for route, line in product(list_of_routes, lines):
    r = line.find(route)