对于多个向量中的X？

Question

如果我有两个向量Vec({'a', 'b', 'c'}, {'a':0})和Vec({'a', 'b', 'c'}, {'b':0})，我怎样才能轻松创建一个for循环来通过a和b？另外，我想在不导入任何内容的情况下这样做。

我目前的错误代码是这样的：

for x in b.f and a.f:
    print(x)

a

当我真的想要打印时：

a
b

Answer 1

如果您使用的是Python 3.3 +：

def chain(*xss):
    for xs in xss:
        yield from xs

for x in chain(['a', 'b'], ['c', 'd']):
    print(x)

或者：

def chain(*xss):
    for xs in xss:
        for x in xs:
            yield x

for x in chain(['a', 'b'], ['c', 'd']):
    print(x)