python之运算符的优先级

• 运算符的优先级
  表达式是有优先级的，例如表达式："0*1+2"和"0+1*2"结果一定不一样，在"0+1*2"中优先运算"1*2"

• 从高到低 ​

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代码练习：

x = 5
y = 6
z = 7
(x * 2 + y) / 2
print((x*2+y)/2)
not x ** 2
print(not x ** 2)
z + 20
print(z + 20)
'a' not in 'abcd'
print('a' not in 'abcd')
x!=y
print(x!=y)
not 1
print(not 1)
0 and 1
print(0 and 1)
3 and 4
print(3 and 4)
5 and 6
print(5 and 6)
7 and 8
print(7 and 8)

 运行结果依次为：