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# Test various flavors of legal and illegal future statements
import unittest
from test import support
import os
import re
rx = re.compile(r'\((\S+).py, line (\d+)')
def get_error_location(msg):
mo = rx.search(str(msg))
return mo.group(1, 2)
class FutureTest(unittest.TestCase):
def check_syntax_error(self, err, basename, lineno, offset=0):
self.assertIn('%s.py, line %d' % (basename, lineno), str(err))
self.assertEqual(os.path.basename(err.filename), basename + '.py')
self.assertEqual(err.lineno, lineno)
self.assertEqual(err.offset, offset)
def test_future1(self):
with support.CleanImport('future_test1'):
from test import future_test1
self.assertEqual(future_test1.result, 6)
def test_future2(self):
with support.CleanImport('future_test2'):
from test import future_test2
self.assertEqual(future_test2.result, 6)
def test_future3(self):
with support.CleanImport('test_future3'):
from test import test_future3
def test_badfuture3(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future3
self.check_syntax_error(cm.exception, "badsyntax_future3", 3)
def test_badfuture4(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future4
self.check_syntax_error(cm.exception, "badsyntax_future4", 3)
def test_badfuture5(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future5
self.check_syntax_error(cm.exception, "badsyntax_future5", 4)
def test_badfuture6(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future6
self.check_syntax_error(cm.exception, "badsyntax_future6", 3)
def test_badfuture7(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future7
self.check_syntax_error(cm.exception, "badsyntax_future7", 3, 53)
def test_badfuture8(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future8
self.check_syntax_error(cm.exception, "badsyntax_future8", 3)
def test_badfuture9(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future9
self.check_syntax_error(cm.exception, "badsyntax_future9", 3, 0)
def test_badfuture10(self):
with self.assertRaises(SyntaxError) as cm:
from test import badsyntax_future10
self.check_syntax_error(cm.exception, "badsyntax_future10", 3, 0)
def test_parserhack(self):
# test that the parser.c::future_hack function works as expected
# Note: although this test must pass, it's not testing the original
# bug as of 2.6 since the with statement is not optional and
# the parser hack disabled. If a new keyword is introduced in
# 2.6, change this to refer to the new future import.
try:
exec("from __future__ import print_function; print 0")
except SyntaxError:
pass
else:
self.fail("syntax error didn't occur")
try:
exec("from __future__ import (print_function); print 0")
except SyntaxError:
pass
else:
self.fail("syntax error didn't occur")
def test_multiple_features(self):
with support.CleanImport("test.test_future5"):
from test import test_future5
def test_unicode_literals_exec(self):
scope = {}
exec("from __future__ import unicode_literals; x = ''", {}, scope)
self.assertIsInstance(scope["x"], str)
if __name__ == "__main__":
unittest.main()
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