monty 0.0.21

A sandboxed, snapshotable Python interpreter written in Rust.
Documentation 
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# list.extend(self) - CPython checks size of input sequence before copying elements,
# so it can handle the case where the input sequence is the list itself.
# Monty must not panic when the iterable is the list itself.
x = [1, 2, 3]
x.extend(x)
assert x == [1, 2, 3, 1, 2, 3]