python运算符（算数运算符、赋值运算符、复合赋值运算符、比较运算符、逻辑运算符）

常见的运算符：

• 算数运算符
• 赋值运算符
• 复合赋值运算符
• ⽐较运算符
• 逻辑运算符

1. 算数运算符

2. 赋值运算符

• 单个变量赋值

a = 1
b = 1
print(a)
print(b)
print(id(a))
print(id(b))

• 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)
print(id(a))
print(id(b))

3. 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)

4. ⽐较运算符

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

5. 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

5.1 拓展

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