Related exemplary set of formula
A, for example, to generate the set {1,4,9,16,25}
# For in the cycle realization
S = SET ()
for I in Range (l, 7):
S.add (I * I)
Print (S) {#. 1,. 4, 36,. 9, 16, 25}
# collection formula
{I = I * S for I in Range (l, 7)}
Print (S) {#. 1,. 4, 36,. 9, 16, 25}
Second, if nested
# for in 循环嵌套if
S = set()
for i in range(1,7):
if i % 2:
S.add(i * i)
print(S)
# 集合生成式
S = { i * i for i in range(1,7) if i % 2}
print(S)
Third, the loop nest
# for in 循环
S = set()
for i in range(1,4):
for j in range(1,4):
S.add((i,j))
print(S)
# 集合生成式
S = { (i,j) for i in range(1,4) for j in range(1,4)}
print(S)