silly inconsistency in pari versus magma interface

<div id="comment:0"></div>


```
sage: a = pari('393')
sage: a.python()
393
sage: a = magma('393')
sage: a.sage()
393     
```

Component: **interfaces**

Author: **William Stein**

Reviewer: **Robert Miller**

Merged: **sage-4.3.1.rc1**

_Issue created by migration from https://trac.sagemath.org/ticket/6960_

