numpy.array setting an array element with a sequence

edit

HellO! I am russian student and I began to study OpenCV :) I write this code:

import cv2
import numpy

def eye_detection():
    src = cv2.imread("E:\\Ilya\\PythonProjects\\eye.jpg")
    if src == None:
        print 'Do not open image!'
        return -1

    gray = cv2.cvtColor(~src, cv2.cv.CV_BGR2GRAY)
    cv2.threshold(gray, 220, 255, cv2.THRESH_BINARY, gray)

    contours = cv2.findContours(gray.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
    #cv2.imwrite(str("E:\\Ilya\\PythonProjects\\") + str("1") + ".jpg", gray)
    #print(contours)
    numpy.array(contours, dtype=numpy.float)
    cv2.drawContours(gray, cv2.cv.Scalar(contours), -1, cv2.cv.RGB(255,255,255), -1)
if __name__ == "__main__":
    eye_detection()

If I compile this script:

line 16, in eye_detection
    numpy.array(contours, dtype=numpy.float)
ValueError: setting an array element with a sequence.

contours contains(print(contours)):

([array([[[344, 254]]]), array([[[194, 243]],

       [[194, 244]],

       [[195, 244]],

       [[196, 244]],

       [[197, 244]],

       [[198, 244]],

       [[199, 244]],

       [[200, 244]],

       [[201, 244]],

       [[202, 244]],

       [[203, 244]],

       [[204, 244]],

       [[205, 244]],

       [[204, 244]],

       [[203, 244]],

       [[202, 244]],

       [[201, 243]],

       [[200, 243]],

       [[199, 243]],

       [[198, 243]],

       [[197, 243]],

       [[196, 243]],

       [[195, 243]]]), array([[[217, 242]], etc.

how to solve this problem?