Thaks @Asmeurer . I understood it.

On Monday, March 30, 2015 at 5:07:52 AM UTC+5:30, Aaron Meurer wrote:
>
> Some functions convert strings to expressions automatically. It is not 
> recommended to do this, though. See 
>
> https://github.com/sympy/sympy/wiki/Idioms-and-Antipatterns#strings-as-input. 
>
>
> Aaron Meurer 
>
> On Sun, Mar 29, 2015 at 8:32 AM, Gaurav Dhingra <axyd...@gmail.com 
> <javascript:>> wrote: 
> > Hi, 
> > 
> >>>> from sympy import symbols, limit 
> >>>> x = symbols('x') 
> >>>> a = "apple" 
> >>>> limit(x, x, a) 
> >       apple 
> > 
> > I do not know the meaning of the a symbol tending to a string. 
> > Even if it is correct then what is its use or significance. 
> > 
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