Replace with_traceback() with exception chaining and reraising (GH-32074)

2 files changed, 6 insertions, 9 deletions

diff --git a/Lib/urllib/parse.py b/Lib/urllib/parse.py
index 67ba308..d70a694 100644
--- a/Lib/urllib/parse.py
+++ b/Lib/urllib/parse.py
@@ -940,10 +940,9 @@ def urlencode(query, doseq=False, safe='', encoding=None, errors=None,
             # but that's a minor nit.  Since the original implementation
             # allowed empty dicts that type of behavior probably should be
             # preserved for consistency
-        except TypeError:
-            ty, va, tb = sys.exc_info()
+        except TypeError as err:
             raise TypeError("not a valid non-string sequence "
-                            "or mapping object").with_traceback(tb)
+                            "or mapping object") from err
 
     l = []
     if not doseq:
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index 02f9626..84997f2 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -1579,8 +1579,7 @@ class FTPHandler(BaseHandler):
             headers = email.message_from_string(headers)
             return addinfourl(fp, headers, req.full_url)
         except ftplib.all_errors as exp:
-            exc = URLError('ftp error: %r' % exp)
-            raise exc.with_traceback(sys.exc_info()[2])
+            raise URLError(f'ftp error: {exp}') from exp
 
     def connect_ftp(self, user, passwd, host, port, dirs, timeout):
         return ftpwrapper(user, passwd, host, port, dirs, timeout,
@@ -1791,7 +1790,7 @@ class URLopener:
         except (HTTPError, URLError):
             raise
         except OSError as msg:
-            raise OSError('socket error', msg).with_traceback(sys.exc_info()[2])
+            raise OSError('socket error', msg) from msg
 
     def open_unknown(self, fullurl, data=None):
         """Overridable interface to open unknown URL type."""
@@ -2093,7 +2092,7 @@ class URLopener:
             headers = email.message_from_string(headers)
             return addinfourl(fp, headers, "ftp:" + url)
         except ftperrors() as exp:
-            raise URLError('ftp error %r' % exp).with_traceback(sys.exc_info()[2])
+            raise URLError(f'ftp error: {exp}') from exp
 
     def open_data(self, url, data=None):
         """Use "data" URL."""
@@ -2443,8 +2442,7 @@ class ftpwrapper:
                 conn, retrlen = self.ftp.ntransfercmd(cmd)
             except ftplib.error_perm as reason:
                 if str(reason)[:3] != '550':
-                    raise URLError('ftp error: %r' % reason).with_traceback(
-                        sys.exc_info()[2])
+                    raise URLError(f'ftp error: {reason}') from reason
         if not conn:
             # Set transfer mode to ASCII!
             self.ftp.voidcmd('TYPE A')