python 合并json

import json
#for i in range(800):
f1=open('.\\'+str(0)+'.txt', "r")
data1 = f1.read()

dic_str2 = json.loads(str(data1).replace("'", "\""))

for i in range(1,50):
    f=open('.\\'+str(i)+'.txt', "r")
    data2 = f.read()
    print(i)
    dic_str1=json.loads(str(data2).replace("'", "\""))
    f.close
    dic_str2["icons"].extend(dic_str1["icons"])
f2=open('.\\1111111111111111111.txt', "a+")
f2.write(str(dic_str2))
f2.close
f1.close