Get artist from spotify api using ClientID

I was using spotify api to get info about a artist with the code below:

spotify_artist = requests.get('https://api.spotify.com/v1/search?q=U2"&type=artist").json()
print(spotify_artist['artists']['items'][0]['genres'])

But I get:

{
  "error": {
    "status": 401,
    "message": "No token provided"
  }
}

So I get a spotify clientID but when I use it its not working:

https://api.spotify.com/v1/search?q=U2%22&type=artist&ClientID=key

(key is the ClientID of the spotify)

But I get the same error:

{
  "error": {
    "status": 401,
    "message": "No token provided"
  }
}

Do you know why?

I generate a key (cliente id) for the example you can see that dont works properly:

Solution

The client id should be sent using client_id variable