trying to find the current project id of the deployed python function in google cloud gives error

Question

I have deployed a python 3.7 function in google cloud. I need to get the project-id through code to find out where it is deployed.

I write a small python 3.7 script and test it through google shell command line

import urllib
import urllib.request
url="http://metadata.google.internal/computeMetadata/v1/project/project-id"
x=urllib.request.urlopen(url)
with x as response:
 x.read()

Unfortunately this gives me only b'' as response. I am not getting the project id though I have set it using

gcloud config set project my-project

Can anyone please help as I am new to google cloud and python? Thanks.

This is an additional issue below: issue 2:

In my local system I have installed gcloud and if I run the above python3.7 script from there

x=urllib.request.urlopen(url) #this line

I am getting this exception from the line above:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/urllib/request.py", line 1350, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 1240, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 1286, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 1235, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 1006, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 946, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/client.py", line 917, in connect
    self.sock = self._create_connection(
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/socket.py", line 787, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/socket.py", line 918, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 8] nodename nor servname provided, or not known

The below changes as suggested by the answer also gives me empty string

Answer 1

In the Python 3.7 runtime, you can get the project ID via an environment variable:

import os
project_id = os.environ['GCP_PROJECT']

In future runtimes, this environment variable will be unavailable, and you'll need to get the project ID from the metadata server:

import urllib.request
url = "http://metadata.google.internal/computeMetadata/v1/project/project-id"
req = urllib.request.Request(url)
req.add_header("Metadata-Flavor", "Google")
project_id = urllib.request.urlopen(req).read().decode()

Running this locally will produce an error because your local machine can't resolve the http://metadata.google.internal URL -- this is only available to deployed functions.