PyZ3950编码错误：移植到Python 3后写入的字节类型错误

Question

我试图在django应用程序中使用PyZ3950连接到数据库以检索数据。这个模块非常古老，它一直适用于Python2，但我找不到适用于Python3的版本

github上的https://github.com/danizen/PyZ3950repo使用2to3.py和一些手动更改来移植应用程序，但是尽管这个库安装得很好，但当我从zoom尝试Connection方法时，它抛出了错误PyZ3950.asn1.EncodingError: Bad type to bytes_write

以下是完整的回溯：

Python 3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019, 19:21:23) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.        
>>> from PyZ3950 import zoom
>>> conn = zoom.Connection ('z3950.loc.gov', 7090)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\zoom.py", line 276, in __init__
    self.connect()
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\zoom.py", line 301, in connect
    self._cli = z3950.Client (self.host, self.port,
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\z3950.py", line 510, in __init__
    self.initresp = self.transact (
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\z3950.py", line 529, in transact
    b = self.encode_ctx.encode (APDU, to_send)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 622, in encode
    spec.encode (self, data)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 1192, in encode
    ctyp.encode (ctx, val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 858, in encode
    self.typ.encode (ctx, val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 796, in encode
    self.encode_val (ctx, val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 1504, in encode_val
    typ.encode (ctx, v)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 858, in encode
    self.typ.encode (ctx, val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 796, in encode
    self.encode_val (ctx, val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 1089, in encode_val
    ctx.bytes_write (val)
  File "D:\Downloads\Applications\PyZ3950-danizen\PyZ3950-master\PyZ3950\asn1.py", line 633, in bytes_write
    raise EncodingError("Bad type to bytes_write")
PyZ3950.asn1.EncodingError: Bad type to bytes_write

Answer 1

虽然我无法具体回答您的问题，但我已尝试更新PyZ3959代码，从Dan Davis的工作开始：https://github.com/danizen/PyZ3950

我没有尝试使代码与Python2和Python3兼容，而是集中精力使其与Python3.7兼容。代码可以在这里找到：https://github.com/heaphey/PyZ3950

我还没有系统地测试过它（我相信Dan正在这么做），但已经让它工作得足够好，可以从OCLC获取MARC记录，等等