Hi,

I would like to parse a string expression like that

from sympy.parsing.sympy_parser import parse_expr
parse_expr("m[0][0]")

But I have an error with 'Symbol' object does not support indexing.

If I do

sympy.Symbol("m[0][0]") 

everything is ok.

I try to write my own transformation funtion that takes the "m[x][y]" and 
creates a Symbol and add it to the standard_transformations in parse_expr 
but the problem is still the same because the problem is in auto_symbol and 
it parses again my string 'm[x][y]'.

Could you tell me how I can do that ?

Thanks,
Loic

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