python yield from用法

Reading data from a generator using yield from

def reader(): """A generator that fakes a read from a file, socket, etc.""" for i in range(4): yield '<< %s' % i def reader_wrapper(g): # Manually iterate over data produced by reader for v in g: yield v wrap = reader_wrapper(reader()) for i in wrap: print(i) # Result << 0 << 1 << 2 << 3

Instead of manually iterating over reader(), we can just yield from it.

def reader_wrapper(g): yield from g

That works, and we eliminated one line of code. And probably the intent is a little bit clearer (or not). But nothing life changing.