return vs yield, yield vs yield from

• return vs yield

Generator can create data instantly without creating multiple data in advance.

def return_abc():
  return list("ABC")
  
def yield_abc():
  yield "A"
  yield "B"
  yield "C"
  
>>> print(return_abc())
['A', 'B', 'C']

>>> print(yield_abc())
<generator object yield_abc at 0x7f4ed03e6040>

 

• yield vs yield from

With yield from, it transformates list immediately.

def yield_abc():
  for ch in ["A", "B", "C"]:
    yield ch
    
def yield_abc():
  yield from ["A", "B", "C"]