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import cv2
#载入图片
img = cv2.imread('test.jpg')
#获取长宽
rows,cols,depth = img.shape
#输入要旋转的角度（逆时针）
print 'Please input angle to rotate counterclockwise:'
degree = raw_input()
degree = float(degree)
#旋转
M = cv2.getRotationMatrix2D((cols/2,rows/2),degree,1)
dst = cv2.warpAffine(img,M,(cols,rows))
#显示旋转后的图片
cv2.namedWindow("Image") 
cv2.imshow("Image", dst) 
cv2.waitKey (0)
cv2.destroyAllWindows()