PyYAML strips \n in the end of documents

[Matěj Cepl <mcepl@…>]

When running the attached script the test fails:

mitmanek:yamlish (master) $ python failing_test.py 
F
======================================================================
FAIL: test_file_output (__main__.TestOuptut)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "failing_test.py", line 52, in test_file_output
    """ % (self._expected, got))
AssertionError: Result matches
              expected = {'bill-to': {'address': {'lines': '458 Walkman Dr. Suite #292 '}}, 'comments': 'Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338'}

              observed = {'bill-to': {'address': {'lines': '458 Walkman Dr.\nSuite #292\n'}}, 'comments': 'Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338\n'}
              

----------------------------------------------------------------------
Ran 1 test in 0.006s

FAILED (failures=1)
mitmanek:yamlish (master) $ 

[Matěj Cepl <mcepl@…>]

simple test case

[Matěj Cepl <mcepl@…>]

simple test case

[Matěj Cepl <mcepl@…>]

New version of the test case show cleanly that only \n in the end of document are killed (why? What's different about them?). Running the test case I get:

mitmanek:yamlish (master) $ unit2 -v failing_test
test_file_output (failing_test.TestOuptut) ... FAIL

======================================================================
FAIL: test_file_output (failing_test.TestOuptut)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/matej/archiv/2012/RedHat/projekty/yamlish/failing_test.py", line 48, in test_file_output
    self.assertEqual(self._expected, got, "Result matches")
AssertionError: {'bill-to': {'address': {'lines': '458 Walkman Dr.\nSuite #292\n'}}, 'comments': [truncated]... != {'bill-to': {'address': {'lines': '458 Walkman Dr.\nSuite #292\n'}}, 'comments': [truncated]...
  {'bill-to': {'address': {'lines': '458 Walkman Dr.\nSuite #292\n'}},
-  'comments': 'Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338'}
+  'comments': 'Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338\n'}
?                                                                                  ++
 : Result matches

----------------------------------------------------------------------
Ran 1 test in 0.009s

FAILED (failures=1)
mitmanek:yamlish (master) $ 

[xi]

PyYAML interpretation is correct: a single newline character in a double-quoted scalar is converted to a space; any trailing newline characters at the end of an unquoted scalar are ignored.

You are sure you understand how \n works in Python strings?