Hi i would need some help with python

Code:
import os
import requests
from requests.exceptions import RequestException

# Function to handle login logic
def login(username, password, login_url):
    try:
        payload = {"username": username, "password": password}
        session = requests.Session()
        headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
        }
        
        # POST request to login URL
        response = session.post(login_url, data=payload, headers=headers)
        
        # Check if the login was successful
        response.raise_for_status()
        
        if "login failed" in response.text.lower():
            print("Login failed. Please check your credentials.")
            return None
        else:
            print("Login successful!")
            return session  # Return session object for further requests
    except RequestException as e:
        print(f"An error occurred during login: {e}")
        return None

# Function to perform post-login actions
def perform_action(session, action_url, action_payload):
    try:
        headers = {"Content-Type": "application/json"}
        response = session.post(action_url, json=action_payload, headers=headers)
        response.raise_for_status()  # Raise exception for any 4xx/5xx errors
        
        print("Action performed successfully!")
        return response.json()  # Return the server's response (optional)
    except RequestException as e:
        print(f"An error occurred while performing the action: {e}")
        return None

# Example usage
login_url = "https://example.com/login"
action_url = "https://example.com/action"

# Load credentials from environment variables
username = os.getenv("USERNAME", "default_username")  # Default for testing
password = os.getenv("PASSWORD", "default_password")

# Ensure environment variables are not empty
if not username or not password:
    raise ValueError("Username and password must be set in environment variables.")

# Log in and maintain the session
session = login(username, password, login_url)

if session is not None:
    # Define the payload for the action after logging in
    action_payload = {"key": "value"}
    
    # Perform the desired action
    perform_action(session, action_url, action_payload)

# Important security note:
# Never hardcode sensitive information such as passwords.
# Use environment variables or secure credential storage mechanisms instead.