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"""Test the interactive interpreter."""
import sys
import os
import unittest
import subprocess
from textwrap import dedent
from test.support import cpython_only, SuppressCrashReport
from test.support.script_helper import kill_python
def spawn_repl(*args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, **kw):
"""Run the Python REPL with the given arguments.
kw is extra keyword args to pass to subprocess.Popen. Returns a Popen
object.
"""
# To run the REPL without using a terminal, spawn python with the command
# line option '-i' and the process name set to '<stdin>'.
# The directory of argv[0] must match the directory of the Python
# executable for the Popen() call to python to succeed as the directory
# path may be used by Py_GetPath() to build the default module search
# path.
stdin_fname = os.path.join(os.path.dirname(sys.executable), "<stdin>")
cmd_line = [stdin_fname, '-E', '-i']
cmd_line.extend(args)
# Set TERM=vt100, for the rationale see the comments in spawn_python() of
# test.support.script_helper.
env = kw.setdefault('env', dict(os.environ))
env['TERM'] = 'vt100'
return subprocess.Popen(cmd_line, executable=sys.executable,
stdin=subprocess.PIPE,
stdout=stdout, stderr=stderr,
**kw)
class TestInteractiveInterpreter(unittest.TestCase):
@cpython_only
def test_no_memory(self):
# Issue #30696: Fix the interactive interpreter looping endlessly when
# no memory. Check also that the fix does not break the interactive
# loop when an exception is raised.
user_input = """
import sys, _testcapi
1/0
print('After the exception.')
_testcapi.set_nomemory(0)
sys.exit(0)
"""
user_input = dedent(user_input)
user_input = user_input.encode()
p = spawn_repl()
with SuppressCrashReport():
p.stdin.write(user_input)
output = kill_python(p)
self.assertIn(b'After the exception.', output)
# Exit code 120: Py_FinalizeEx() failed to flush stdout and stderr.
self.assertIn(p.returncode, (1, 120))
if __name__ == "__main__":
unittest.main()
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