Merge pull request #207 in LCL/wolframclientforpython from bugfix/376952-traceback-fix to master

* commit '79402a86ea31c8a301d69593d21b851f8935aa9e':
  adding .DS_Store to gitignore
  Revert "adding gitignore"
  fixing single line traceback
  chain was not defined
  adding gitignore

Author: crazyeng

.gitignore

@@ -9,4 +9,5 @@ wolframclient/tests/local_config.json
 .coverage
 .vscode
 *.code-workspace
-/test-reports
+/test-reports
+.DS_Store

wolframclient/language/traceback.py

@@ -236,6 +236,7 @@ def _get_lines_from_file(filename, lineno, context_lines, loader=None, module_na
                 break
         source = [force_text(sline, encoding, "replace") for sline in source]
 
+    lineno = min(lineno, len(source) - 1)
     lower_bound = max(0, lineno - context_lines)
     upper_bound = lineno + context_lines
 

wolframclient/utils/six.py

@@ -2,10 +2,11 @@
 
 import datetime
 import decimal
+import itertools
 import platform
 import sys
 import types
-import itertools
+
 # stripped version of SIX
 
 PY2 = sys.version_info[0] == 2
@@ -57,12 +58,20 @@
         memoryview = buffer
     buffer_types = (bytearray, memoryview, buffer)
 
-iterable_types = [list, tuple, set, frozenset, types.GeneratorType, itertools.chain, itertools.groupby]
+iterable_types = [
+    list,
+    tuple,
+    set,
+    frozenset,
+    types.GeneratorType,
+    itertools.chain,
+    itertools.groupby,
+]
 if not PY2:
     iterable_types.extend((map, range))
 
 protected_types = tuple(
-    chain(
+    itertools.chain(
         string_types,
         integer_types,
         (