我想在python中加载这个JSON数据：
JSON数据：
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我的Python代码：
import json
json_data = open('test.txt', 'r').read()
data = json.loads(json_data)
我确定JSON数据是有效的，因为是一个网站的结果，我需要在python中加载它并获取用户名值。
实际错误：
MacBook-Pro-di-admin:freelancer11 admin$ python load.py
Traceback (most recent call last):
File "load.py", line 6, in <module>
data = json.loads(json_data)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 338, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 382, in raw_decode
obj, end = self.scan_once(s, idx)
ValueError: Expecting : delimiter: line 1 column 4099 (char 4098)