kedro.framework.context.context.KedroContextError with Kedro 0.17.0

Description

Short description of the problem here. I kept facing the ModuleNotFoundError then came across this post about the similar issue. Further after implementing the recommended solution (snipet below), I got this error:

_add_src_to_path(Path.cwd()/“src”, Path.cwd()) context = load_context(path_to_project) output = context.run()

Context

How has this bug affected you? What were you trying to accomplish? I was trying to deploy the kedro application on Docker using flask API. But the error occured while implementing the Flask API

Steps to Reproduce

1. [Create the flask python file] I created the python file containing my flask scripts with the useful imports. Everything works fine while using the default route to test the Flask API Everything breaks when I call the load_context(path_to_project) (snipet below)

@app.route(‘/run’) def run(): _add_src_to_path(Path.cwd()/“src”, Path.cwd()) context = load_context(path_to_project) output = context.run() return output

1. [Call the run route] Got the kedro.framework.context.context.KedroContextError with the following detail: kedro.framework.context.context.KedroContextError: Failed to find the pipeline named ‘default’. It needs to be generated and returned by the ‘_get_pipelines’ function.

Expected Result

I should receive a JSON outpout showing: {“Model has a coefficient R^2 of 0.456.”}

Actual Result

I face the error explained in step 2. [Call the run route]

 File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/kedro/framework/context/context.py", line 253, in _get_pipeline
    return pipelines[name]
KeyError: '__default__'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/zoumanakeita/Desktop/Personal/Learn_Kedro/iris-kedro/flask-app.py", line 16, in run
    output = context.run()
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/kedro/framework/context/context.py", line 561, in run
    pipeline = self._get_pipeline(name=pipeline_name)
  File "/Users/zoumanakeita/opt/anaconda3/envs/awesome-kedro-project-env/lib/python3.7/site-packages/kedro/framework/context/context.py", line 259, in _get_pipeline
    ) from exc
kedro.framework.context.context.KedroContextError: Failed to find the pipeline named '__default__'. It needs to be generated and returned by the '_get_pipelines' function.

Your Environment

Include as many relevant details about the environment in which you experienced the bug:

• Kedro version used (pip show kedro or kedro -V): kedro, version 0.17.0
• Python version used (python -V): Python 3.7.9
• Operating system and version: MacOS Catanina Version 10.15.4
• Environment: virtual environment used to run the program
• Error status: happens when running the Flask Application

[zoumdatascience]

Hi @MerelTheisenQB,

Thank you for your feedback, the code that I was not pointing to the correct path of the project, so the step by step debugging (as you suggested) helped me find the issue. So my final code is below:

@app.route('/run')
def run():
    project_path = Path.cwd()
    metadata = _get_project_metadata(project_path)
    _add_src_to_path(metadata.source_dir, project_path)
    session = KedroSession.create(metadata.package_name, project_path)
    context = session.load_context()
    
    output = context.run()
    return output

if __name__ == '__main__':
    app.run(debug=True)

Have a great week!

[merelcht]

It’s built by kedro, you can use it by importing it like this from kedro.framework.startup import _add_src_to_path 🙂