运算符介绍
一、算数运算符
注意：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) |
结果如下：
- 多变量赋相同值
| a = b = 10 | |
| print(a) | |
| print(b) |
结果如下：
三、复合赋值运算符
| a = b = 10 | |
| print(a) | |
| print(b) | |
| 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 |
拓展：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 |
六、总结
正文完