monty 0.0.21

A sandboxed, snapshotable Python interpreter written in Rust.
Documentation 
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# call-external
# Test that assigning to a frozen dataclass raises FrozenInstanceError
point = make_point()
point.x = 10
"""
TRACEBACK:
Traceback (most recent call last):
  File "dataclass__frozen_set_error.py", line 4, in <module>
    point.x = 10
    ~~~~~~~
FrozenInstanceError: cannot assign to field 'x'
"""