names=['Alice','Bob','Candy','David','Ellena']
name_set=set(names)
for i in name_set:
name=i.lower() #lower首字母小寫
names.append(name)
name_set=set(names)
if 'alice' and 'bob' and 'Bob' in name_set:
print(True)
else:
print(False)
L = [95.5, 85, 59, 66, 72]
n=len(L)
j=0
for i in range(n):
for j in range(0,n-j-1):
if L[j]<L[j+1]:
L[j], L[j+1] = L[j+1], L[j]
for count in range(n):
if (count<3):
print(L[count])
else:
break
