對於多個向量中的X？

Question

如果我有兩個向量Vec({'a', 'b', 'c'}, {'a':0})和Vec({'a', 'b', 'c'}, {'b':0})我怎樣才能輕鬆創建一個for循環來通過a和b？另外，我想在不輸入任何內容的情況下執行此操作

我現在不正確的代碼是這樣的：

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

a 

當我真的想打印：

a 
b 

Answer 1

如果您正在使用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)