python运算符的结合性探究

is_has_key = False

is_entered_door = False

is_passed_scan = False

is_know_password = True

# and比or的优先级高，or的结合性是左

print(is_has_key or is_entered_door and is_passed_scan or is_know_password)     # True

# 在复杂表达式中使用小括号指定运算顺序

print((is_has_key or (is_entered_door and is_passed_scan)) or is_know_password) # True

# 将复杂表达式拆分成几步来完成

step1 = is_entered_door and is_passed_scan

step2 = is_has_key or step1

step3 = step2 or is_know_password

print(step3)    # True