文本中保存的内容为：
{
'QQQ': [0.067, 0.167, 0.2, 0.033, 0.233, 0.267, 0.1, 0.133],
'TTT': [0.5, 0.375, 0.25, 0.3, 0.6, 0.333, 0.857, 0.636, 0.667, 0.556]
}
用eval转换为字符串时报错：
File "test.py", line 43, in d1
data = eval(infile.readline())
File "<string>", line 1, in <module>
NameError: name 'nan' is not defined
解决：
globals = {
'nan': 0
}
# -----------
data = eval(infile.readline(), globals)
参考资料：
Python中，用eval强制将字符串转换为字典变量时候出错：NameError: name ‘null’ is not defined