Referencing modules

[asavaritayal]

Currently, any file / module references in main.py have to be with respect to the top level function app.

For e.g. -

FunctionApp
    |__ HttpTrigger1
             |__ function.json
             |__ main.py
             |__ model.pkl
    |__ host.json
    |__ requirements.txt

# main.py
import os
import azure.functions

def main(req: azure.functions.HttpRequest):

    # file reference wrt top level function app
    f = open('HttpTrigger1/model.pkl', 'rb')
   

Can we have relative paths instead? E.g. - f = open('model.pkl', 'rb')

[elprans]

The issue is that the current working directory is a global per-process setting. It's impossible to do a chdir without affecting other functions that may be executing concurrently.

[elprans]

The recommended way to reference local files in Python in general is to use __file__:

import pathlib

open(pathlib.Path(__file__).parent / 'model.pkl', 'rb')

[asavaritayal]

Okay. Do you recommend the same for importing modules as well?

Here's the issue I'm running into:

FunctionApp
    |__ HttpTrigger1
             |__ function.json
             |__ main.py
             |__ example.py

# main.py 

import example #fails
import HttpTrigger/example #also fails

[elprans]

Modules should be imported using the relative import syntax:

from . import example

[asavaritayal]

That works - thanks!

[paolosalvatori]

What about if the function uses packages like helpers in the sample below?

FunctionApp
    |__ HttpTrigger1
             |__ function.json
             |__ main.py
             |__ example.py
             |__ helpers
                     |__ jwt
                             |__ __init__.py

It looks like placing the helpers package in the same folder as the python function is not enough. As a workaround, we had to explicitly add the current folder to the path as follows:

from sys import path
from os.path import dirname, join
path.append(dirname(__file__))

import json
from helpers.jwt import JWT
...

[elprans]

Use from .helpers import jwt

[paolosalvatori]

Thanks @elprans

[anindya5]

Hi,

My issue is if I want to import a function say function1 in module1 of SharedCode, but for me the SharedCode is inside the API folder, like below

FunctionApp
|_ HttpTrigger1
     |_ __init__.py
     |_ function.json
     |_ SharedCode
        |_ module1.py
        |_ module2.py
|_ HttpTrigger2
     |_ __init__.py
     |_ function.json

The functions are defined inside module1 and module2

Usually I'd have done
from ShareCode.module1 import function1

That does not work.

from .ShareCode.module1 import function1 also gives module not found error, shown below

Executed 'Functions.HtmBatchAzureFunc' (Failed, Id=d70ee3dc-dca2-4d89-b39c-5c902ed64b11)
[5/22/19 8:54:05 PM] System.Private.CoreLib: Exception while executing function: Functions.HtmBatchAzureFunc. System.Private.CoreLib: Result: Failure
[5/22/19 8:54:05 PM] Exception: ModuleNotFoundError: No module named 'htm_shared_src'
[5/22/19 8:54:05 PM] Stack: File "/usr/local/Cellar/azure-functions-core-tools/2.7.1158/workers/python/deps/azure/functions_worker/dispatcher.py", line 229, in _handle__function_load_request

Can anyone help