问在列表索引上迭代JSON - typeError

EN

import json
#from pprint import pprint

with open('/tmp/myfile.json') as f:
    data = json.load(f)
line_entries = len(data)
len_w = len(data[0]["w"])
#print(line_entries)
line_iter = 0
main_iter = 0
sub_iter = 0
while line_iter < line_entries:
    v = data[line_iter]["v"]["h"]
    c = data[line_iter]["v"]["d"]
    print("=========================================================")
    print("Dest: ", v)
    print("Cart: ", c)

    while sub_iter < len_wp:
        sn = data[line_iter]["w"][sub_iter]["s"]["n"]
        at = data[line_iter]["w"][sub_iter]["at"]
        dt = data[line_iter]["w"][sub_iter]["dt"]
        sub_iter = sub_iter + 1
        print(sn)
        print(at)
        print(dt)
    line_iter = line_iter + 1
    print("=========================================================")

v = data[line_iter]["v"]["h"]
TypeError: list indices must be integers or slices, not str