Flask syntax error (possible installation issue)
I want to try some stuff in flask, and I am stuck right at the beginning.
I typed this in a new file:
from flask import Flask app = Flask(__name__)
And I get this error (running as python 3.5). If I try to run it as legacy python it does not raise this syntax error.
Traceback (most recent call last): File "/private/var/mobile/Containers/Shared/AppGroup/5E22383E-122A-4BBE-9677-E4A0EF63E7C3/Pythonista3/Documents/flask-experiências/app.py", line 1, in <module> from flask import Flask File "/private/var/mobile/Containers/Shared/AppGroup/5E22383E-122A-4BBE-9677-E4A0EF63E7C3/Pythonista3/Documents/site-packages/flask/__init__.py", line 21, in <module> from .app import Flask, Request, Response File "/private/var/mobile/Containers/Shared/AppGroup/5E22383E-122A-4BBE-9677-E4A0EF63E7C3/Pythonista3/Documents/site-packages/flask/app.py", line 1264 raise exc_type, exc_value, tb ^ SyntaxError: invalid syntax
I am afraid I could have messed system packages while installing modules... Not sure if I tryed to pip install flask.
when you use stash pip to install modules, it installes the 2.7 version. pythonista comes with flask installed, so just delete that folder from site packages,
After you delete the
flaskfolder from your
site-packages, you might need to restart Pythonista to make the import work again. Python caches imported modules internally, so sometimes you need to fully restart Python to clear old modules from the cache.
@JonB I only work with Python 3. Is there a way to install new modules into Python 3?
Also, is the bundled version of Flask compatible with Python 3?
The version you have installed is version 0.7 or earlier. Pythonista comes installed with version 0.10.1. Current version is 0.12.x.
The pythonista version is compatible with py3 ( as are current versions), so if you delete the version in site packages, you should be good to go with 0.10.
If you need 0.12, pip install should work, but often requires some manual intervention. In this case, you just need to manually install the missing click dependency:
pip install flask pip install click
In other cases, with complex setup.py, you can
pip download, then
tar -xvzfthen figure out what needs to be copied.
Ok. Thanks. I have deleted that folder and it seems to work now.