Python/运算符

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算术运算符为:+, -, *, / , %, // , **, _ 分别为加、减、乘、浮点除、取余数、整数除、幂运算、上个表达式结果的值。

比较运算符为:==, !=, >, <, >=, <=

位运算符:&, |, ^, ~ , >>, <<

逻辑运算符: and, or, not

成员运算符: in, not in 在指定的序列中能否找到该值

身份运算符:is, is not 判断两个标识符是不是引用自一个对象,类似 id(x) == id(y)

walrus运算符:在表达式中执行赋值操作。例如:

# Handle a matched regex
if (match := pattern.search(data)) is not None:
    # Do something with match

# A loop that can't be trivially rewritten using 2-arg iter()
while chunk := file.read(8192):
   process(chunk)

# Reuse a value that's expensive to compute
[y := f(x), y**2, y**3]

# Share a subexpression between a comprehension filter clause and its output
filtered_data = [y for x in data if (y := f(x)) is not None]