(s, t, prec=0, rnd=round_fast)
return mpf_add(s, t, prec, rnd, 1)
Return the difference of two raw mpfs, s-t. This function is
    simply a wrapper of mpf_add that changes the sign of t.
Return the difference of two raw mpfs, s-t. This function is
    simply a wrapper of mpf_add that changes the sign of t.
Return the difference of two raw mpfs s - t . This function is simply a wrapper of mpf_add that changes the sign of t .
def mpf_sub(s, t, prec=0, rnd=round_fast):
    """Return the difference of two raw mpfs, s-t. This function is
    simply a wrapper of mpf_add that changes the sign of t."""
    return mpf_add(s, t, prec, rnd, 1)
def mpf_sub ( s , t , prec = 0 , rnd = round_fast ) : return mpf_add ( s , t , prec , rnd , 1 )