in amazon_transcribe/structures.py [0:0]
def readinto(self, b, read1=False):
if not isinstance(b, memoryview):
b = memoryview(b)
b = b.cast("B")
if read1:
data = self.read1(len(b))
else:
data = self.read(len(b))
if data is None:
raise BlockingIOError("readinto")
n = len(data)
b[:n] = data
return n