[Python] Can connect via Postman but not via python script

I am helping my client to solve a problem. He tries to call my API but is unsuccessful.

Situation:

• my API is accessible via postman and the browser (swagger). It works.
• On the same computer via a python script I cannot access to the API

error:

Caused by NewCOnnectionError('<urllib3.connection.HTTPConnection object at 0x000001310A6F5C0>:
Failed to establish a new connection: [Errno 11001] getaddrinfo failed')
​

If I try a very simple script

import requests
r = requests.get('http://google.com')


I get the same error.

I assume there some problem with firewall/proxy but why does Postman work? In which direction can I direct my client to solve problem?

I also tried ping and it doesn't work either:

$ ping www.google.com

Ping request could not found host www.google.com. Pleas check the name and try again.

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