From 97ec355648eb1db3e6d1cfe69fc2e34e8e5f5631 Mon Sep 17 00:00:00 2001
From: astaric <anze.staric@gmail.com>
Date: Thu, 8 Sep 2016 21:30:09 +0200
Subject: [PATCH 1/2] CSVReader: Keep original exceptions stack trace

---
 Orange/data/io.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Orange/data/io.py b/Orange/data/io.py
index c3d90308ef4..e491f251dd0 100644
--- a/Orange/data/io.py
+++ b/Orange/data/io.py
@@ -688,7 +688,7 @@ def read(self):
                 except Exception as e:
                     error = e
                     continue
-        raise ValueError('Cannot parse dataset {}: {}'.format(self.filename, error))
+        raise ValueError('Cannot parse dataset {}: {}'.format(self.filename, error)) from error
 
     @classmethod
     def write_file(cls, filename, data):

From f04649a4e77df60de510b1598408233a4d02af51 Mon Sep 17 00:00:00 2001
From: astaric <anze.staric@gmail.com>
Date: Thu, 8 Sep 2016 21:55:03 +0200
Subject: [PATCH 2/2] Flags: Do not crash if attribute cannot be parsed

Fixes a problem, where files containing paths as attribute values could
not be read. Reading failed when the value of the attribute was parsed
as a python literal.
---
 Orange/data/io.py               | 10 +++++++---
 Orange/tests/test_tab_reader.py | 11 +++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/Orange/data/io.py b/Orange/data/io.py
index e491f251dd0..c8942a87866 100644
--- a/Orange/data/io.py
+++ b/Orange/data/io.py
@@ -122,9 +122,13 @@ def __init__(self, flags):
             if self._RE_ALL.match(flag):
                 if '=' in flag:
                     k, v = flag.split('=', 1)
-                    self.attributes[k] = (v if Flags._RE_ATTR_UNQUOTED_STR(v) else
-                                          literal_eval(v) if v else
-                                          '')
+                    if not Flags._RE_ATTR_UNQUOTED_STR(v):
+                        try:
+                            v = literal_eval(v)
+                        except SyntaxError:
+                            # If parsing failed, treat value as string
+                            pass
+                    self.attributes[k] = v
                 else:
                     setattr(self, flag, True)
                     setattr(self, self.ALL.get(flag, ''), True)
diff --git a/Orange/tests/test_tab_reader.py b/Orange/tests/test_tab_reader.py
index 56209c47e99..6a80217d17d 100644
--- a/Orange/tests/test_tab_reader.py
+++ b/Orange/tests/test_tab_reader.py
@@ -83,6 +83,17 @@ def test_read_and_save_attributes(self):
         self.assertEqual(c1.name, "Class 1")
         self.assertEqual(c1.attributes, {'x': 'a longer string'})
 
+        path = "/path/to/somewhere"
+        c1.attributes["path"] = path
+        outf = io.StringIO()
+        outf.close = lambda: None
+        TabReader.write_file(outf, table)
+        outf.seek(0)
+
+        table = read_tab_file(outf)
+        f1, f2, c1, c2 = table.domain.variables
+        self.assertEqual(c1.attributes["path"], path)
+
     def test_read_data_oneline_header(self):
         samplefile = """\
         data1\tdata2\tdata3