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# Tests invocation of the interpreter with various command line arguments
# All tests are executed with environment variables ignored
# See test_cmd_line_script.py for testing of script execution
import os
import test.support, unittest
import sys
import subprocess
def _spawn_python(*args):
cmd_line = [sys.executable]
# When testing -S, we need PYTHONPATH to work (see test_site_flag())
if '-S' not in args:
cmd_line.append('-E')
cmd_line.extend(args)
return subprocess.Popen(cmd_line, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
def _kill_python(p):
return _kill_python_and_exit_code(p)[0]
def _kill_python_and_exit_code(p):
p.stdin.close()
data = p.stdout.read()
p.stdout.close()
# try to cleanup the child so we don't appear to leak when running
# with regrtest -R. This should be a no-op on Windows.
subprocess._cleanup()
returncode = p.wait()
return data, returncode
class CmdLineTest(unittest.TestCase):
def start_python(self, *args):
return self.start_python_and_exit_code(*args)[0]
def start_python_and_exit_code(self, *args):
p = _spawn_python(*args)
return _kill_python_and_exit_code(p)
def exit_code(self, *args):
cmd_line = [sys.executable, '-E']
cmd_line.extend(args)
with open(os.devnull, 'w') as devnull:
return subprocess.call(cmd_line, stdout=devnull,
stderr=subprocess.STDOUT)
def test_directories(self):
self.assertNotEqual(self.exit_code('.'), 0)
self.assertNotEqual(self.exit_code('< .'), 0)
def verify_valid_flag(self, cmd_line):
data = self.start_python(cmd_line)
self.assertTrue(data == b'' or data.endswith(b'\n'))
self.assertTrue(b'Traceback' not in data)
def test_optimize(self):
self.verify_valid_flag('-O')
self.verify_valid_flag('-OO')
def test_q(self):
self.verify_valid_flag('-Qold')
self.verify_valid_flag('-Qnew')
self.verify_valid_flag('-Qwarn')
self.verify_valid_flag('-Qwarnall')
def test_site_flag(self):
if os.name == 'posix':
# Workaround bug #586680 by adding the extension dir to PYTHONPATH
from distutils.util import get_platform
s = "./build/lib.%s-%.3s" % (get_platform(), sys.version)
if hasattr(sys, 'gettotalrefcount'):
s += '-pydebug'
p = os.environ.get('PYTHONPATH', '')
if p:
p += ':'
os.environ['PYTHONPATH'] = p + s
self.verify_valid_flag('-S')
def test_usage(self):
self.assertTrue(b'usage' in self.start_python('-h'))
def test_version(self):
version = ('Python %d.%d' % sys.version_info[:2]).encode("ascii")
self.assertTrue(self.start_python('-V').startswith(version))
def test_verbose(self):
# -v causes imports to write to stderr. If the write to
# stderr itself causes an import to happen (for the output
# codec), a recursion loop can occur.
data, rc = self.start_python_and_exit_code('-v')
self.assertEqual(rc, 0)
self.assertTrue(b'stack overflow' not in data)
data, rc = self.start_python_and_exit_code('-vv')
self.assertEqual(rc, 0)
self.assertTrue(b'stack overflow' not in data)
def test_run_module(self):
# Test expected operation of the '-m' switch
# Switch needs an argument
self.assertNotEqual(self.exit_code('-m'), 0)
# Check we get an error for a nonexistent module
self.assertNotEqual(
self.exit_code('-m', 'fnord43520xyz'),
0)
# Check the runpy module also gives an error for
# a nonexistent module
self.assertNotEqual(
self.exit_code('-m', 'runpy', 'fnord43520xyz'),
0)
# All good if module is located and run successfully
self.assertEqual(
self.exit_code('-m', 'timeit', '-n', '1'),
0)
def test_run_module_bug1764407(self):
# -m and -i need to play well together
# Runs the timeit module and checks the __main__
# namespace has been populated appropriately
p = _spawn_python('-i', '-m', 'timeit', '-n', '1')
p.stdin.write(b'Timer\n')
p.stdin.write(b'exit()\n')
data = _kill_python(p)
self.assertTrue(data.find(b'1 loop') != -1)
self.assertTrue(data.find(b'__main__.Timer') != -1)
def test_run_code(self):
# Test expected operation of the '-c' switch
# Switch needs an argument
self.assertNotEqual(self.exit_code('-c'), 0)
# Check we get an error for an uncaught exception
self.assertNotEqual(
self.exit_code('-c', 'raise Exception'),
0)
# All good if execution is successful
self.assertEqual(
self.exit_code('-c', 'pass'),
0)
# Test handling of non-ascii data
if sys.getfilesystemencoding() != 'ascii':
command = "assert(ord('\xe9') == 0xe9)"
self.assertEqual(
self.exit_code('-c', command),
0)
def test_unbuffered_output(self):
# Test expected operation of the '-u' switch
for stream in ('stdout', 'stderr'):
# Binary is unbuffered
code = ("import os, sys; sys.%s.buffer.write(b'x'); os._exit(0)"
% stream)
data, rc = self.start_python_and_exit_code('-u', '-c', code)
self.assertEqual(rc, 0)
self.assertEqual(data, b'x', "binary %s not unbuffered" % stream)
# Text is line-buffered
code = ("import os, sys; sys.%s.write('x\\n'); os._exit(0)"
% stream)
data, rc = self.start_python_and_exit_code('-u', '-c', code)
self.assertEqual(rc, 0)
self.assertEqual(data.strip(), b'x',
"text %s not line-buffered" % stream)
def test_unbuffered_input(self):
# sys.stdin still works with '-u'
code = ("import sys; sys.stdout.write(sys.stdin.read(1))")
p = _spawn_python('-u', '-c', code)
p.stdin.write(b'x')
p.stdin.flush()
data, rc = _kill_python_and_exit_code(p)
self.assertEqual(rc, 0)
self.assertTrue(data.startswith(b'x'), data)
def test_large_PYTHONPATH(self):
with test.support.EnvironmentVarGuard() as env:
path1 = "ABCDE" * 100
path2 = "FGHIJ" * 100
env['PYTHONPATH'] = path1 + os.pathsep + path2
code = """
import sys
path = ":".join(sys.path)
path = path.encode("ascii", "backslashreplace")
sys.stdout.buffer.write(path)"""
code = code.strip().splitlines()
code = '; '.join(code)
p = _spawn_python('-S', '-c', code)
stdout, _ = p.communicate()
p.stdout.close()
self.assertTrue(path1.encode('ascii') in stdout)
self.assertTrue(path2.encode('ascii') in stdout)
def test_hash_randomization(self):
# Verify that -R enables hash randomization:
self.verify_valid_flag('-R')
hashes = []
for i in range(2):
code = 'print(hash("spam"))'
data, rc = self.start_python_and_exit_code('-R', '-c', code)
self.assertEqual(rc, 0)
hashes.append(data)
self.assertNotEqual(hashes[0], hashes[1])
# Verify that sys.flags contains hash_randomization
code = 'import sys; print("random is", sys.flags.hash_randomization)'
data, rc = self.start_python_and_exit_code('-R', '-c', code)
self.assertEqual(rc, 0)
self.assertIn(b'random is 1', data)
def test_main():
test.support.run_unittest(CmdLineTest)
test.support.reap_children()
if __name__ == "__main__":
test_main()
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