Fail to import rospy

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Hello Guys

I'm trying to implement a code to call ROS topics inside a Python code.

When i try to import rospy and roslib I have the message:

import roslib
ImportError: No module named roslib

my initial code is:

from collections import deque
import numpy as np
import argparse
import imutils
import cv2
import os # incluido para chamar comando do linux.
import time #incluido para utilizar o delay
import roslib
import rospy
from geometry_msgs.msg import Twist