讀空的json檔案，python2和python3 的錯誤提示是不一樣的

python2:

ValueError: No JSON object could be decoded

python3:

json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

解決：

針對python2

import json
data ={"vf":"ff"}
'''
#寫入
with open('tmp.json', 'w') as f:
    json.dump(data, f)
 
'''
try:
    with open('tmp.json', 'r') as f:
        k=json.load(f)
        print(k)
except ValueError:
　　print("empty!")

針對python3

import json
data ={"vf":"ff"}
'''
#寫入
with open('tmp.json', 'w') as f:
    json.dump(data, f)
'''
try:
    with open('tmp.json', 'r') as f:
        k=json.load(f)
        print(k)
except json.decoder.JSONDecodeError:
    print(
 
"empty!")