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# This module is not entirely compatible with CPython
import os
os.putenv("TEST_VARIABLE", "TEST_VALUE")
print(os.getenv("TEST_VARIABLE"))
print(os.getenv("TEST_VARIABLE", "TEST_DEFAULT_VALUE"))
os.unsetenv("TEST_VARIABLE")
print(os.getenv("TEST_VARIABLE"))
print(os.getenv("TEST_VARIABLE", "TEST_DEFAULT_VALUE"))
print(os.system("exit 0"))
rand = os.urandom(4)
print(type(rand) is bytes, len(rand))
os.errno(2)
print(os.errno())
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