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# Tests invocation of the interpreter with various command line arguments
# Most tests are executed with environment variables ignored
# See test_cmd_line_script.py for testing of script execution
import test.support, unittest
import os
import sys
from test.script_helper import spawn_python, kill_python, assert_python_ok, assert_python_failure
# spawn_python normally enforces use of -E to avoid environmental effects
# but one test checks PYTHONPATH behaviour explicitly
# XXX (ncoghlan): Give script_helper.spawn_python an option to switch
# off the -E flag that is normally inserted automatically
import subprocess
def _spawn_python_with_env(*args):
cmd_line = [sys.executable]
cmd_line.extend(args)
return subprocess.Popen(cmd_line, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
# XXX (ncoghlan): Move to script_helper and make consistent with run_python
def _kill_python_and_exit_code(p):
data = kill_python(p)
returncode = p.wait()
return data, returncode
class CmdLineTest(unittest.TestCase):
def test_directories(self):
assert_python_failure('.')
assert_python_failure('< .')
def verify_valid_flag(self, cmd_line):
rc, out, err = assert_python_ok(*cmd_line)
self.assertTrue(out == b'' or out.endswith(b'\n'))
self.assertNotIn(b'Traceback', out)
self.assertNotIn(b'Traceback', err)
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):
self.verify_valid_flag('-S')
def test_usage(self):
rc, out, err = assert_python_ok('-h')
self.assertIn(b'usage', out)
def test_version(self):
version = ('Python %d.%d' % sys.version_info[:2]).encode("ascii")
rc, out, err = assert_python_ok('-V')
self.assertTrue(err.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.
rc, out, err = assert_python_ok('-v')
self.assertNotIn(b'stack overflow', err)
rc, out, err = assert_python_ok('-vv')
self.assertNotIn(b'stack overflow', err)
def test_run_module(self):
# Test expected operation of the '-m' switch
# Switch needs an argument
assert_python_failure('-m')
# Check we get an error for a nonexistent module
assert_python_failure('-m', 'fnord43520xyz')
# Check the runpy module also gives an error for
# a nonexistent module
assert_python_failure('-m', 'runpy', 'fnord43520xyz'),
# All good if module is located and run successfully
assert_python_ok('-m', 'timeit', '-n', '1'),
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
assert_python_failure('-c')
# Check we get an error for an uncaught exception
assert_python_failure('-c', 'raise Exception')
# All good if execution is successful
assert_python_ok('-c', 'pass')
# Test handling of non-ascii data
if sys.getfilesystemencoding() != 'ascii':
if test.support.verbose:
import locale
print('locale encoding = %s, filesystem encoding = %s'
% (locale.getpreferredencoding(), sys.getfilesystemencoding()))
command = "assert(ord('\xe9') == 0xe9)"
assert_python_ok('-c', command)
# On Windows, pass bytes to subprocess doesn't test how Python decodes the
# command line, but how subprocess does decode bytes to unicode. Python
# doesn't decode the command line because Windows provides directly the
# arguments as unicode (using wmain() instead of main()).
@unittest.skipIf(sys.platform == 'win32',
'Windows has a native unicode API')
def test_undecodable_code(self):
undecodable = b"\xff"
env = os.environ.copy()
# Use C locale to get ascii for the locale encoding
env['LC_ALL'] = 'C'
code = (
b'import locale; '
b'print(ascii("' + undecodable + b'"), '
b'locale.getpreferredencoding())')
p = subprocess.Popen(
[sys.executable, "-c", code],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
env=env)
stdout, stderr = p.communicate()
if p.returncode == 1:
# _Py_char2wchar() decoded b'\xff' as '\udcff' (b'\xff' is not
# decodable from ASCII) and run_command() failed on
# PyUnicode_AsUTF8String(). This is the expected behaviour on
# Linux.
pattern = b"Unable to decode the command from the command line:"
elif p.returncode == 0:
# _Py_char2wchar() decoded b'\xff' as '\xff' even if the locale is
# C and the locale encoding is ASCII. It occurs on FreeBSD, Solaris
# and Mac OS X.
pattern = b"'\\xff' "
# The output is followed by the encoding name, an alias to ASCII.
# Examples: "US-ASCII" or "646" (ISO 646, on Solaris).
else:
raise AssertionError("Unknown exit code: %s, output=%a" % (p.returncode, stdout))
if not stdout.startswith(pattern):
raise AssertionError("%a doesn't start with %a" % (stdout, pattern))
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)
rc, out, err = assert_python_ok('-u', '-c', code)
data = err if stream == 'stderr' else out
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)
rc, out, err = assert_python_ok('-u', '-c', code)
data = err if stream == 'stderr' else out
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_with_env('-S', '-c', code)
stdout, _ = p.communicate()
self.assertIn(path1.encode('ascii'), stdout)
self.assertIn(path2.encode('ascii'), stdout)
def test_main():
test.support.run_unittest(CmdLineTest)
test.support.reap_children()
if __name__ == "__main__":
test_main()
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