path.py 文件源码

def crc32(self):

        if not self.isfile():
            raise TypeError('cannot compute crc32, not a file: {}'.format(self.abspath()))

        else:

            try:

                with open(self.abspath(), 'rb') as buf:
                    buf = "%08X" % (binascii.crc32(buf.read()) & 0xFFFFFFFF)

                    return buf

            except FileNotFoundError:
                raise FileNotFoundError('failed to compute crc32 for: {}'.format(self.abspath()))

            except PermissionError:
                raise PermissionError('failed to compute crc32 for: {}'.format(self.abspath()))

            except:
                raise RuntimeError('failed to compute crc32 for: {}'.format(self.abspath()))