so far, i tried:

cmd = ['bash','-c', 'source /ros/setup.bash && env']
env = subprocess.check_output(cmd, stderr=subprocess.STDOUT, text=True)


for e in env.split("\n"):
    if e:
        name = e.split("=", 1)[0]
        value = e.split("=", 1)[1]
        os.environ[name] = value
        


import rclpy
# my code

but still got the error ModuleNotFoundError: No module named 'rclpy'