test_fileio.py 文件源码

def testReadinto(self):
        # verify readinto
        self.f.write(bytes([1, 2]))
        self.f.close()
        a = array('b', b'x'*10)
        self.f = _FileIO(TESTFN, 'r')
        n = self.f.readinto(a)
        self.assertEqual(array('b', [1, 2]), a[:n])