Question: I have only one python installed in my system: 3.10.10. it includes the latest pip: 23.1.2 and I installed the latest module of firebase_functions After I try to init firebase functions in my machine I follow the instructions and when it asks me to install dependencies I get this error: ERROR: To modify pip, please run the following command: C:\Users\XXX\functions\venv\Scripts\python.exe -m pip install --upgrade pip Error: An unexpected error has occurred.  Next time I run the same process but this time I did not accept to install dependencies and it worked:  Firebase initialization complete!  Now this is the default code google provided: # Welcome to Cloud Functions for Firebase for Python! # To get started, simply uncomment the below code or create your own. # Deploy with `firebase deploy` from firebase_functions import https_fn from firebase_admin import initialize_app initialize_app() @https_fn.on_request() def on_request_example(req: https_fn.Request) -> https_fn.Response: return https_fn.Response("Hello world!")  I have all dependencies installed. I made sure thousand times. When I run firebase deploy  I get this error: i deploying functions i functions: preparing codebase default for deployment i functions: ensuring required API cloudfunctions.googleapis.com is enabled... i functions: ensuring required API cloudbuild.googleapis.com is enabled... i artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled... + functions: required API cloudbuild.googleapis.com is enabled + artifactregistry: required API artifactregistry.googleapis.com is enabled + functions: required API cloudfunctions.googleapis.com is enabled Error: An unexpected error has occurred.  And this is the log in the firebase-debug.log [debug] [2023-06-11T13:05:29.172Z] stderr: ModuleNotFoundError: No module named 'firebase_functions' [debug] [2023-06-11T13:05:29.182Z] Error: spawn "C:\Users\XXX\functions\venv\Scripts\activate.bat" ENOENT at notFoundError (C:\Users\XXX\AppData\Roaming\npm\node_modules\firebase-tools\node_modules\cross-spawn\lib\enoent.js:6:26) at verifyENOENT (C:\Users\XXX\AppData\Roaming\npm\node_modules\firebase-tools\node_modules\cross-spawn\lib\enoent.js:40:16) at cp.emit (C:\Users\XXX\AppData\Roaming\npm\node_modules\firebase-tools\node_modules\cross-spawn\lib\enoent.js:27:25) at ChildProcess._handle.onexit (node:internal/child_process:291:12) [error] Error: An unexpected error has occurred. 

Answer: Apparently firebase creates its own python dependency separately from your own python version in your machine. It is stored in the venv folder. To make it work follow the following steps: firebase init  Choose functions: Functions: Configure a Cloud Functions directory and its files When it asks: Do you want to install dependencies now? (Y/n) Choose No Open cmd within the functions project and then: cd functions\venv\Scripts python.exe -m pip install --upgrade pip python.exe -m pip install firebase_functions cd ../../../  And now: firebase init functions  Choose Overwrite, and then: File functions/requirements.txt already exists. Overwrite? No File functions/.gitignore already exists. Overwrite? No File functions/main.py already exists. Overwrite? No Do you want to install dependencies now? Yes  And now: firebase deploy --only functions  And it should work perfectly