import os.path
def read_into_buffer(filename):
buf = bytearray(os.path.getsize(filename))
with open(filename, 'rb') as f:
f.readinto(buf)
return buf
with open('sample.bin', 'wb') as f:
f.write(b'Hello World')
buf = read_into_buffer('sample.bin')
print(buf)
buf[0:5] = b'Hallo'
print(buf)
with open('newsample.bin', 'wb') as f:
f.write(buf)
record_size = 30
buf = bytearray(record_size)
with open('somefile', 'rb') as f:
while True:
n = f.readinto(buf)
if n < record_size:
break
print(n)
buf = b'Hello World'
m1 = memoryview(buf)
m2 = m1[-5:]
print(m2)
print(m2[:])
print(buf)
