我试图使我的WSGI服务器实现与Python 2和Python 3兼容.我有这个密码:
def start_response(status, response_headers, exc_info = None):
if exc_info:
try:
if headers_sent:
# Re-raise original exception if headers sent.
raise exc_info[0], exc_info[1], exc_info[2]
finally:
# Avoid dangling circular ref.
exc_info = None
elif headers_set:
raise AssertionError("Headers already set!")
headers_set[:] = [status, response_headers]
return write
...相关部分包括:
# Re-raise original exception if headers sent.
raise exc_info[0], exc_info[1], exc_info[2]
Python 3不再支持该语法,因此必须将其翻译为:
raise exc_info[0].with_traceback(exc_info[1], exc_info[2])
问题:Python2语法在Python3中生成了一个解析错误.如何编写可以被Python 2和Python 3解析的代码?我试过以下方法,但不起作用:
if sys.version_info[0] >= 3:
raise exc_info[0].with_traceback(exc_info[1], exc_info[2])
else:
eval("raise exc_info[0], exc_info[1], exc_info[2]; 1", None, { 'exc_info': exc_info })