def METHOD_NAME(qw, qx, qy, qz):
    '''
    Translates from Quaternion to Pitch. 
    @param qw,qx,qy,qz: Quaternion values
    @type qw,qx,qy,qz: float
    @return Pitch value translated from Quaternion
    '''
    rotateYa0=-2.0*(qx*qz - qw*qy)
    rotateY=0.0
    if(rotateYa0 >= 1.0):
        rotateY = pi/2.0
    elif(rotateYa0 <= -1.0):
        rotateY = -pi/2.0
    else:
        rotateY = asin(rotateYa0)
    return rotateY