Linting fix: raise from

Author: goodmami

delphin/tdl.py

@@ -989,7 +989,8 @@ def _bounded(p1, p2, line, pos, line_no, lines):
                 pattern = 'docstring' if p1 == '"""' else 'block comment'
                 raise TDLSyntaxError(
                     f'unterminated {pattern}',
-                    lineno=start_line_no)
+                    lineno=start_line_no
+                ) from None
             pos = end = 0
     substrings.append(line[pos:end])
     end += len(p2)
@@ -1094,7 +1095,7 @@ def _parse_tdl(tokens, path):
             if environment is not None and obj is not None:
                 environment.entries.append(obj)
     except StopIteration:
-        raise TDLSyntaxError('unexpected end of input.')
+        raise TDLSyntaxError('unexpected end of input.') from None
 
 
 def _parse_tdl_definition(identifier, tokens):

delphin/util.py

@@ -447,12 +447,12 @@ def next(self, skip=None):
                     popleft()
                 except IndexError:
                     if not self._buffer_fill():
-                        raise StopIteration
+                        raise StopIteration from None
         try:
             datum = popleft()
         except IndexError:
             if not self._buffer_fill():
-                raise StopIteration
+                raise StopIteration from None
             datum = popleft()
         return datum
 
@@ -471,7 +471,7 @@ def peek(self, n=0, skip=None, drop=False):
                     datum = popleft()
                 except IndexError:
                     if not self._buffer_fill():
-                        raise StopIteration
+                        raise StopIteration from None
                     datum = popleft()
                 if not skip(datum):
                     n -= 1

delphin/web/server.py

@@ -226,8 +226,8 @@ def on_get(self, req, resp):
     def on_get_name(self, req, resp, name):
         try:
             entry = self.index[name]
-        except KeyError:
-            raise falcon.HTTPNotFound()
+        except KeyError as e:
+            raise falcon.HTTPNotFound() from e
         ts = itsdb.TestSuite(entry['path'])
         quote = urllib.parse.quote
         base = req.uri
@@ -238,8 +238,8 @@ def on_get_name(self, req, resp, name):
     def on_get_table(self, req, resp, name, table):
         try:
             entry = self.index[name]
-        except KeyError:
-            raise falcon.HTTPNotFound()
+        except KeyError as e:
+            raise falcon.HTTPNotFound() from e
         ts = itsdb.TestSuite(entry['path'])
         table_ = ts[table]