Python基础之运算符

Posted 2022-11-18

一、算数运算符

混合运算优先级顺序： () ⾼于 ** ⾼于 * / // % ⾼于 + -

二、赋值运算符

单个变量赋值
num = 1
print(num)
多个变量赋值
num1, float1, str1 = 10, 0.5, hello world
print(num1)
print(float1)
print(str1)
多变量赋相同值
a = b = 10
print(a)
print(b)

三、复合赋值运算符

a = 100
a += 1
# 输出101 a = a + 1,最终a = 100 + 1
print(a)

b = 2
b *= 3
# 输出6 b = b * 3,最终b = 2 * 3
print(b)

c = 10
c += 1 + 2
# 输出13, 先算运算符右侧1 + 2 = 3， c += 3 , 推导出c = 10 + 3
print(c)

四、⽐较运算符

⽐较运算符也叫关系运算符， 通常⽤来判断。

a = 7
b = 5
print(a == b) # False
print(a != b) # True
print(a < b) # False
print(a > b) # True
print(a <= b) # False
print(a >= b) # True

五、逻辑运算符

a = 1
b = 2
c = 3
print((a < b) and (b < c)) # True
print((a > b) and (b < c)) # False
print((a > b) or (b < c)) # True
print(not (a > b)) # True

六、扩展

数字之间的逻辑运算
a = 0
b = 1
c = 2

# and运算符，只要有⼀个值为0，则结果为0，否则结果为最后⼀个⾮0数字
print(a and b) # 0
print(b and a) # 0
print(a and c) # 0
print(c and a) # 0
print(b and c) # 2
print(c and b) # 1

# or运算符，只有所有值为0结果才为0，否则结果为第⼀个⾮0数字
print(a or b) # 1
print(a or c) # 2
print(b or c) # 1