python，判断的顺序先后顺序是怎样的，求解答

Question

if math.pi / 2 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 + (math.pi / 2 - 1.3) or math.pi / 2 * 3 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 * 3 + (math.pi / 2 - 1.3):

Answer 1

总体套路就两个：
　　1、优先级：() > not > and > or
　　2、同级执行方向：从左到右

从这个例子， 大概就是先算括号里的， 然后从左到右做算术运算， 再做 <= 运算， 最后做OR 运算

import math
angle = 4.5

print(math.pi / 2 * 3 - (math.pi / 2 - 1.3))
print(math.pi / 2 * 3 + (math.pi / 2 - 1.3))

print(math.pi / 2 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 + (math.pi / 2 - 1.3) )
print(math.pi / 2 * 3 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 * 3 + (math.pi / 2 - 1.3))


print( math.pi / 2 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 + (math.pi / 2 - 1.3) or math.pi / 2 * 3 - (math.pi / 2 - 1.3) <= angle <= math.pi / 2 * 3 + (math.pi / 2 - 1.3) )