the yield is able to execute an expression and return a value in time sequence rather than calculate them all and return in list; mostly used as generator
yield example
return multivalue in sequence
def func():
yield 1
yield 2
yield 3
iterator generator
def iterator_gen():
i=1
while True:
yield i*i
i+=1
for a in iterator_gen():
if a<100:
break
print(a)
yield from
def get_content(entry):
for block in entry.get_blocks():
yield block
#can be refactored with yield from to accelerate 15%
def get_content(entry):
yield from entry.get_blocks()
