豬流感血液檢測
你因為嚴重頭痛去看醫生。醫生隨機選擇你做豬流感的血液檢測；在你所在的城市，推估每 9,000 人中有 1 人感染。此檢測的準確率為 99%，也就是偽陽性的機率為 1%。偽陰性的機率為 0。
在你檢測呈陽性的情況下，回答下列問題。
本練習屬於課程
Python 機率基礎
動手互動練習
試著完成這個範例程式碼，體驗一下這個練習。
# 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)