1 #coding=utf-8
2 '''
3 北大4.0
4 成绩 学分
5 100～90 4.0
6 89～85 3.7
7 84～82 3.3
8 81～78 3.0
9 77～75 2.7
10 74～72 2.3
11 71～68 2.0
12 67～64 1.5
13 63～60 1.0
14 59～0 0
15 平均学分绩点=∑(课程学分×成绩绩点)/∑课程学分=各门课程学分绩点之和/各门课程学分数之和
16 '''
17 filename='./myscore.txt'
18 list1=[]
19 def cal():
20 fr=open(filename)
21 for line in fr.readlines():
22 line1=line.strip("\n").split(",")
23 # print(line1)
24 a=float(line1[0])
25 b=float(line1[1])
26 if(a>=90):
27 list1.append((a,(b,4.0)))
28 if(a>=85 and a<=89):
29 list1.append((a,(b,3.7)))
30 if(a>=82 and a<=84):
31 list1.append((a,(b,3.3)))
32 if(a>=78 and a<=81):
33 list1.append((a,(b,3.0)))
34 if(a>=75 and a<=77):
35 list1.append((a,(b,2.7)))
36 if(a>=72 and a<=74):
37 list1.append((a,(b,2.3)))
38 if(a>=68 and a<=71):
39 list1.append((a,(b,2.0)))
40 if(a>=64 and a<=67):
41 list1.append((a,(b,1.5)))
42 if(a>=60 and a<=63):
43 list1.append((a,(b,1.0)))
44 if(a<60):
45 list1.append((a,(b,0.0)))
46
47 # print(list1)
48 # print(list1.keys())
49 # print(list1.values())
50 c=list1
51 sum_p=0
52 sum_s=0
53 # print(c)
54 for i in range(len(c)):
55 sum_p=sum_p+c[i][1][0]*c[i][1][1]
56 sum_s=sum_s+c[i][1][0]
57 # print(sum_p)
58 # print(sum_s)
59 result=sum_p/sum_s
60 print("北大4.0(GPA):%.2f"%result)
61
62 if __name__ == '__main__':
63 cal()
