Railway•16mo ago

Deploying python 2.7 flask app

Hello, I have no choice but to use python 2.7. However i am having trouble deploying my flask application.

python: No module named venv

python: No module named venv

venv doesnt exist until python 3 , how can i deploy it with virtualenv instead?

15 Replies

Percy•16mo ago

Project ID: N/A

Percy•16mo ago

You might find these helpful: - deploying with node and python - deploy error - Deployment problem

⚠️ experimental feature

jackson•16mo ago

wouldn't recommend using a virtual environment in a production setting, the containers are all destroyed and remade on each redeploy anyways so you can just have a requirements.txt file in the root directory and it will be automatically picked up and installed if you're using nixpacks

jakeAnon•16mo ago

is there way to disable? my requirements.txt file just has

Flask==1.1.2
flask_cors==3.0.10
python-dotenv==0.18.0

Flask==1.1.2
flask_cors==3.0.10
python-dotenv==0.18.0

started failing once i added a runtime.txt with python-2.7.10

jackson•16mo ago

try removing the last line there, but you'll need to set the nixpacks python version like documented here https://nixpacks.com/docs/providers/python

Python | Nixpacks

App source + Nix packages + Docker = Image

jackson•16mo ago

and rename any Dockerfile you may have to something like Dockerfile.dev

jakeAnon•16mo ago

thanks, ill give it a try and report back For people in future: Was able to get it the venv addressed by using following nixpacks.toml

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && pip install -r requirements.txt']

[start]
cmd = 'python main.py'

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && pip install -r requirements.txt']

[start]
cmd = 'python main.py'

However I am now getting new error, Traceback (most recent call last): File "main.py", line 1, in <module> from flask import Flask, request, abort ImportError: No module named flask with my requirements.txt

virtualenv==16.7.10
Flask==1.1.2
flask_cors==3.0.10
python-dotenv==0.18.0

virtualenv==16.7.10
Flask==1.1.2
flask_cors==3.0.10
python-dotenv==0.18.0

jackson•16mo ago

why is flask in there twice? should just be the capital f Flask iirc

jakeAnon•16mo ago

my apologies it is just the capital F, meant to delete that

jackson•16mo ago

ah so the start command doesn't activate the virtualenv first change it to be like this

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && pip install -r requirements.txt']

[start]
cmd = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && python main.py']

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && pip install -r requirements.txt']

[start]
cmd = ['virtualenv /opt/virtualenv && . /opt/virtualenv/bin/activate && python main.py']

jakeAnon•16mo ago

I changed the [start] cmd to a single string as thats what it was expecting

created virtual environment CPython3.10.9.final.0-64 in 423ms
creator CPython3Posix(dest=/opt/virtualenv, clear=False, no_vcs_ignore=False, global=False)
seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/root/.local/share/virtualenv)
added seed packages: Flask==1.1.2, Flask_Cors==3.0.10, Jinja2==3.1.2, MarkupSafe==2.1.2, Werkzeug==2.2.3, click==8.1.3, itsdangerous==2.1.2, pip==22.2.2, python_dotenv==0.18.0, setuptools==65.3.0, six==1.16.0, virtualenv==16.7.10, wheel==0.37.1
activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
Traceback (most recent call last):
File "/app/main.py", line 1, in <module>
from flask import Flask, request, abort
File "/opt/virtualenv/lib/python3.10/site-packages/flask/__init__.py", line 14, in <module>
from jinja2 import escape
ImportError: cannot import name 'escape' from 'jinja2' (/opt/virtualenv/lib/python3.10/site-packages/jinja2/__init__.py)

created virtual environment CPython3.10.9.final.0-64 in 423ms
creator CPython3Posix(dest=/opt/virtualenv, clear=False, no_vcs_ignore=False, global=False)
seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/root/.local/share/virtualenv)
added seed packages: Flask==1.1.2, Flask_Cors==3.0.10, Jinja2==3.1.2, MarkupSafe==2.1.2, Werkzeug==2.2.3, click==8.1.3, itsdangerous==2.1.2, pip==22.2.2, python_dotenv==0.18.0, setuptools==65.3.0, six==1.16.0, virtualenv==16.7.10, wheel==0.37.1
activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
Traceback (most recent call last):
File "/app/main.py", line 1, in <module>
from flask import Flask, request, abort
File "/opt/virtualenv/lib/python3.10/site-packages/flask/__init__.py", line 14, in <module>
from jinja2 import escape
ImportError: cannot import name 'escape' from 'jinja2' (/opt/virtualenv/lib/python3.10/site-packages/jinja2/__init__.py)

looks like the virtualenv its creating is using 3.10.9 and not 2.7

jackson•16mo ago

try removing virtualenv entirely and just using something like this

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = '/usr/bin/python2 -m pip install -r requirements.txt'

[start]
cmd = '/usr/bin/python2 main.py'

[phases.setup]
nixPkgs = ['python27', 'gcc', 'virtualenv']

[phases.install]
cmds = '/usr/bin/python2 -m pip install -r requirements.txt'

[start]
cmd = '/usr/bin/python2 main.py'

i think that would be where nix installs the python2 package

jakeAnon•16mo ago

 /usr/bin/python2: No such file or directory
&
 /usr/bin/python2.7: No such file or directory
&
 /usr/bin/python27: No such file or directory

 /usr/bin/python2: No such file or directory
&
 /usr/bin/python2.7: No such file or directory
&
 /usr/bin/python27: No such file or directory

odd because that one link you shared has 2.7 on there

Brody•16mo ago

could have updated your app to use python3 by now

jakeAnon•16mo ago

trust me if i could i would

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Deploying python 2.7 flask app