Unable to import flask

[zjn0505]

In which file did you encounter the issue?

/appengine/standard/flask/hello_world/main.py

Did you change the file? If so, how?

no

Describe the issue

Like it is said in the guide, "Flask is bundled into the runtime". I suppose as long as flask is added to libraries in app.yaml, I should be able to import it from main.py. That is what has been implemented after this commit. But I still get ImportError: No module named flask.

I've tested on online console and local env that I can't import flask simply by adding it to app.yaml, and I tested PIL in the same way, which managed to be imported.

[michaelawyu]

Hi @zjn0505 ! If you do not mind me asking, are you running your application directly (python main.py) or with dev_appserver.py (dev_appserver.py app.yaml)?

[zjn0505]

Hi @michaelawyu, I ran it with dev_appserver.py app.yaml in local terminal and from the cloud console, both failed with ImportError: No module named flask

[michaelawyu]

Hi @zjn0505 , what version of gcloud are you currently using? You can check it by running gcloud --version in the terminal.

[zjn0505]

Local env is:

Google Cloud SDK 179.0.0
app-engine-go
app-engine-python 1.9.62
bq 2.0.27
core 2017.11.06
gsutil 4.28

Cloud env is:

Google Cloud SDK 179.0.0
alpha 2017.09.15
app-engine-go
app-engine-java 1.9.59
app-engine-php " "
app-engine-python 1.9.62
beta 2017.09.15
bq 2.0.27
cloud-datastore-emulator 1.3.0
core 2017.11.06
datalab 20171003
docker-credential-gcr
gcd-emulator v1beta3-1.0.0
gsutil 4.28
kubectl
pubsub-emulator 2017.09.15

[michaelawyu]

Thanks, @zjn0505 !

Do you have Extra Libraries component for Python installed? It can be installed with

gcloud components install app-engine-python-extras

After installing this extra library you should be able to use built-in flask library without a problem. For more information, refer to this page :)

[zjn0505]

This is it, thank you.