测试本地 Azure 函数 (Python) 时出现 ImportError？

Question

当我尝试使用 VS Code 中的调试工具在本地运行 Python 函数时，我的一个依赖项出现 ImportError（可能与它的依赖项无关，但它是 pyodbc）。

我的requirements.txt 文件中列出了依赖项，并且在云中部署和运行时，整个事情都可以正常工作。

所以，问题很简单：如何通过确保正确导入具有依赖关系的本地 Python 函数来测试它们？

添加更多信息：

启动调试器时，将在 Azure Functions 项目根目录中的 .venv 上运行 pip 安装。根据我的调试器输出，文件存在：

Requirement already satisfied: pyodbc in ./.venv/lib/python3.7/site-packages (from -r requirements.txt (line 7)) (4.0.30)

日志如下：

[6/3/20 7:30:48 PM] Job host started
Hosting environment: Development
Content root path: /Users/my_user/Code/my_directory/azureFunctions
Now listening on: http://0.0.0.0:7071
Application started. Press Ctrl+C to shut down.

Http Functions:

        bhimodelv2: [GET,POST] http://localhost:7071/api/bhimodelv2

[6/3/20 7:30:53 PM] Host lock lease acquired by instance ID '000000000000000000000000391A9F18'.
[6/3/20 7:30:53 PM]  INFO: Starting Azure Functions Python Worker.
[6/3/20 7:30:53 PM]  INFO: Worker ID: e14f3a90-8abd-43f5-8148-90d9d3d98fe3, Request ID: 45d82e44-b75b-40c2-bc94-2afe387d401a, Host Address: 127.0.0.1:63322
[6/3/20 7:30:53 PM]  INFO: Successfully opened gRPC channel to 127.0.0.1:63322
[6/3/20 7:30:53 PM]  INFO: Received WorkerInitRequest, request ID 45d82e44-b75b-40c2-bc94-2afe387d401a
[6/3/20 7:30:53 PM]  INFO: Received FunctionLoadRequest, request ID: 45d82e44-b75b-40c2-bc94-2afe387d401a, function ID: 4cf1e7c7-82ea-4921-aee1-e521bd6c37a1
[6/3/20 7:30:53 PM] Worker failed to function id 4cf1e7c7-82ea-4921-aee1-e521bd6c37a1.
[6/3/20 7:30:53 PM] Result: Failure
[6/3/20 7:30:53 PM] Exception: ImportError: dlopen(/Users/my_user/Code/my_directory/azureFunctions/.venv/lib/python3.7/site-packages/pyodbc.cpython-37m-darwin.so, 2): Library not loaded: /usr/local/opt/unixodbc/lib/libodbc.2.dylib
[6/3/20 7:30:53 PM]   Referenced from: /Users/my_user/Code/my_directory/azureFunctions/.venv/lib/python3.7/site-packages/pyodbc.cpython-37m-darwin.so
[6/3/20 7:30:53 PM]   Reason: image not found
[6/3/20 7:30:53 PM] Stack:   File "/Users/my_user/.nvm/versions/node/v10.16.3/lib/node_modules/azure-functions-core-tools/bin/workers/python/3.7/OSX/X64/azure_functions_worker/dispatcher.py", line 243, in _handle__function_load_request
[6/3/20 7:30:53 PM]     func_request.metadata.entry_point)
[6/3/20 7:30:53 PM]   File "/Users/my_user/.nvm/versions/node/v10.16.3/lib/node_modules/azure-functions-core-tools/bin/workers/python/3.7/OSX/X64/azure_functions_worker/loader.py", line 66, in load_function
[6/3/20 7:30:53 PM]     mod = importlib.import_module(fullmodname)
[6/3/20 7:30:53 PM]   File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
[6/3/20 7:30:53 PM]     return _bootstrap._gcd_import(name[level:], package, level)
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 983, in _find_and_load
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 983, in _find_and_load
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap_external>", line 728, in exec_module
[6/3/20 7:30:53 PM]   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
[6/3/20 7:30:53 PM]   File "/Users/my_user/Code/my_directory/azureFunctions/bhimodelv2/__init__.py", line 3, in <module>
[6/3/20 7:30:53 PM]     import pyodbc

因此，在 pip 安装成功后确认文件存在于虚拟环境中之后，就会发生导入错误。

Answer 1

好吧，我错了——具体的模块是相关的。 pyodbc 在本地运行时需要您 brew install unixodbc。将函数部署到 Azure 时不会发现任何问题，因为 Azure 已经安装了这些驱动程序。

这里是where I found that information