1. import random
2. from collections import defaultdict
3.  
4.  
5. history = []
6. last_seen_4 = 0
7. last_seen_5 = 0
8. last_roll_not_feature = True
9. missed = 0
10. featured = ['Weapon A','Weapon B']
11.  
12. def get5star():
13.     global last_roll_not_feature
14.     global missed
15.  
16.     #epitomised path
17.     if missed == 2:
18.         missed = 0
19.         return "Weapon A"
20.  
21.  
22.     if last_roll_not_feature:
23.         last_roll_not_feature = False
24.  
25.         featured_weapon = random.choice(featured)
26.  
27.         if featured_weapon == "Weapon A":
28.             missed = 0
29.             return "Weapon A"
30.         else:
31.             missed += 1
32.             return "Weapon B"
33.    
34.    
35.     if random.random() <= 0.75:
36.         last_roll_not_feature = False
37.         featured_weapon = random.choice(featured)
38.  
39.         if featured_weapon == "Weapon A":
40.             missed = 0
41.             return "Weapon A"
42.         else:
43.             missed += 1
44.             return "Weapon B"
45.  
46.  
47.     else:
48.         last_roll_not_feature = True
49.         missed += 1
50.         return "Non-featured"
51.  
52.  
53. def gacha():
54.     global last_seen_5
55.     global last_seen_4
56.     GACHA = random.random()
57.  
58.     if GACHA <= 0.007 or last_seen_5 == 80:
59.         last_seen_5 = 0
60.         last_seen_4 = 0
61.         return get5star()
62.    
63.     elif GACHA <= 0.067 or last_seen_4 == 9:
64.         last_seen_4 = 0
65.         last_seen_5 += 1
66.         return "some 4 star character"
67.     else:
68.         last_seen_5 +=1
69.         last_seen_4 +=1
70.         return "nice 3 star sword"
71.  
72. history_5_star = defaultdict(int)
73. history_total = []
74.  
75. for i in range(10000):
76.     history = []
77.     total_pull = 0
78.     featured_count = 0
79.     while(featured_count < 1):
80.         PULL = gacha()
81.         total_pull += 1
82.         history += [PULL]
83.         if PULL == 'Weapon A':
84.             featured_count += 1
85.     history_total += [total_pull]
86.  
87.  
88.  
89.  
90. print("Average pulls required for R1 featured 5 star weapon" ,sum(history_total)/len(history_total))