What is the Python code to check all the GenerativeAI models supported by Google Gemini?

Being new to GenerativeAI world, I am trying to load a pre-trained text generation model and doing some stuff which is not working. This is how I load the GenerativeAI model.

from vertexai.generative_models import GenerativeModel
generation_model = GenerativeModel("gemini-pro")

Since it does not work, I feel I might have to use some other GenerativeAI model, not "gemini-pro". Even I try following piece of code to check all the models supported by Gemini.

import google.generativeai as genai
for model in genai.list_models():
    if 'generateContent' in model.supported_generation_methods:
        print(model.name)

But I get 'PermissionDenied' error as attached image shows.

Now as a programmer I have 2 queries here.

Q1. Can I see the GenerativeAI models supported by Gemini or not?

Q2. If answer is 'Yes', what is the Python code?

List models sample for AI studio Gemini. Did you forget the configure?

from dotenv import load_dotenv
import google.generativeai as genai
import os

load_dotenv()
genai.configure(api_key=os.getenv("API_KEY"))
genai.configure(transport='grpc')

def list_models():
    for i, m in zip(range(5), genai.list_models()):
        print(f"Name: {m.name} Description: {m.description} support: {m.supported_generation_methods}")

if __name__ == "__main__":
    list_models()