猪流感血液检测
您因严重头痛去看医生。医生随机将您选中做猪流感血液检测。据怀疑，您所在城市每 9,000 人中有 1 人感染。该检测的准确率为 99%，也就是说误报（假阳性）的概率为 1%。漏报（假阴性）的概率为 0。
在您检测呈阳性的前提下，回答下面的问题。
本练习是课程的一部分
Python 概率基础
交互式实操练习
通过完成这段示例代码来试试这个练习。
# Probability of having Swine_flu
P_Swine_flu = 1./9000
# Probability of not having Swine_flu
P_no_Swine_flu = 1 - ____
# Probability of being positive given that you have Swine_flu
P_Positive_g_Swine_flu = ____
# Probability of being positive given that you do not have Swine_flu
P_Positive_g_no_Swine_flu = ____
# Probability of Positive
P_Positive = (____ * ____) + (____ * ____)
# Bayes' rule for P(Swine_flu|Positive)
P_Swine_flu_g_Positive = (____ * ____) / P_Positive
print(P_Swine_flu_g_Positive)