@public
def poly_from_expr(expr, *gens, **args):
 opt = options.build_options(gens, args)
 return _poly_from_expr(expr, opt)

@ public def poly_from_expr ( expr , * gens , ** args ) : opt = options . build_options ( gens , args ) return _poly_from_expr ( expr , opt )
construct a polynomial from an expression .