从Swagger编辑器生成Swagger服务器（Python Flask）时出错

Question

I've used the Swagger Editor to manually generate my Swagger spec file and generated the files for a Python Flask server. Following the README I installed connexion, but when I run python app.py I get the error: ValueError: need more than 1 value to unpack. Any ideas?

Full stack trace below:

No handlers could be found for logger "connexion.api"
Traceback (most recent call last):
  File "app.py", line 5, in <module>
    app.add_api('swagger.yaml')
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/app.py", line 144, in add_api
    debug=self.debug)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/api.py", line 127, in __init__
    self.add_paths()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/api.py", line 198, in add_paths
    six.reraise(*sys.exc_info())
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/api.py", line 187, in add_paths
    self.add_operation(method, path, endpoint, path_parameters)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/api.py", line 160, in add_operation
    resolver=self.resolver)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/operation.py", line 168, in __init__
    resolution = resolver.resolve(self)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/resolver.py", line 50, in resolve
    return Resolution(self.resolve_function_from_operation_id(operation_id), operation_id)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/resolver.py", line 71, in resolve_function_from_operation_id
    return self.function_resolver(operation_id)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/connexion/utils.py", line 106, in get_function_from_name
    module_name, attr_path1 = module_name.rsplit('.', 1)
ValueError: need more than 1 value to unpack

Answer 1

I ran into this as well. From what I see, the generated code from Swagger seems to assume you're using Python 3. While connexion supports both Python 2.7 & 3.4+, it does need a __init__.py file in the generated python-flask-server/ base directory as well as inside the controllers/ subdirectory to work for Python 2.7 (Implicit Namespace Packages were introduced in Python 3.3). If you create those 2 empty files after generating the code, things should work. If the Swagger generator wants to support Python 2.7 (since connexion allows for it), it would just need to provide those files as well.