frozenset([1,2])
a = set(!,2)
a = set(1,2)
a = set({1,2})
b = set({2,3})
from collections import *
union\
a.intersection(b)
a
a.union(b)
a
b
d = 2
x = 0
y = 0
 21                 return self.sw if cond else self.sw.get(c)¬                     
list(range(x-d, x+d+1))
list(range(1, d+1))
list(range(-(d-i)+1, d-i))
i = 1
list(range(-(d-i)+1, d-i))
list(range(-(d-i), d-i+1))
i
d
i=2
list(range(-(d-i), d-i+1))
300/52
400/52
350/52
350/70
350/90
100/90
100/90 + 5
100/90 + 6
100/90 + 5
