monty 0.0.21

A sandboxed, snapshotable Python interpreter written in Rust.
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import math

math.factorial(-1)
"""
TRACEBACK:
Traceback (most recent call last):
  File "math__factorial_negative_error.py", line 3, in <module>
    math.factorial(-1)
    ~~~~~~~~~~~~~~~~~~
ValueError: factorial() not defined for negative values
"""