Safer way to sympify unsanitized input

## Project description

# Safer Sympify

Convert unsanitized user input into SymPy expression.

This does not prevent all possible attacks. However, this is much safer than using `eval()`

, which SymPy still does.

See SymPy PR12524 for more details: https://github.com/sympy/sympy/pull/12524

## Examples

```
Create a SymPy expression from user input.
This uses pure Python syntax.
Whitelisted operators and functions only are allowed.
>>> expr = SaferSympify().str2sympy('-sqrt(1 + a**b*b)/((a**b)*b+1)')
>>> expr
-1/sqrt(a**b*b + 1)
Get free symbols:
>>> sorted(expr.free_symbols, key=lambda x: str(x))
[a, b]
Evaluate expression:
>>> expr.evalf(subs={'a': 1, 'b': 3, 'c': 5}) # Note extra values can be passed too
-0.500000000000000
Simplify expression:
>>> expr.simplify()
-1/sqrt(a**b*b + 1)
Pretty-print expression as Latex (could be displayed in browser with MathJax)
>>> sympy.latex(expr)
'- \\frac{1}{\\sqrt{a^{b} b + 1}}'
```

## Project details

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