sympy__sympy-13471
Based on the error message and the issue description, I can understand the problem. When Python 2 pickles a sympy Float expression, it saves the mantissa as a hex string that includes the L suffix for long integers (e.g., '1L'). When…
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Based on the error message and the issue description, I can understand the problem. When Python 2 pickles a sympy Float expression, it saves the mantissa as a hex string that includes the `L` suffix for long integers (e.g., `'1L'`). When Python 3 tries to unpickle this, it fails because Python 3's `int()` function doesn't accept the `L` suffix.
The error occurs at line 1045 in `sympy/core/numbers.py`:
```python
num[1] = long(num[1], 16)
```
When `num[1]` is `'1L'` (a Python 2 long literal string), Python 3 can't parse it.
The fix needs to strip the trailing `L` from the hex string before co
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