import json
from base64 import b64decode
response = {"result":0,"system":{"redirect":0,"uid":"","controller":"otherAuthService","trace_id":"AC1000F715911718971352421047CF","token_id":"","time_stamp":1591171897,"need_login":0,"action":"getImageCode","session_id":"0edc4984c34543d09adef33f9cb4c745","new_version":"3.1.0","auth_status":0,"email":""},"data":{"result":0,"result_rows":{"session_id":"0edc4984c34543d09adef33f9cb4c745","image_code_base64":"/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a
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=======================================
file_path='D:\img\'
response_parsed = json.loads(response)
img = response['data']['result_rows']['image_code_base64']
temp = base64.b64decode(img)
with open(file_path + "a.jpg", "wb") as fp:
fp.write(temp)