def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def create_texture():
  global rgbtex
  rgbtex = glGenTextures(1)
  glBindTexture(TEXTURE_TARGET, rgbtex)
  glTexImage2D(TEXTURE_TARGET,0,GL_RGB,640,480,0,GL_RGB,GL_UNSIGNED_BYTE,None)