diff --git a/Lib/_pydecimal.py b/Lib/_pydecimal.py
index ff23322ed5603e..ab7b3deab3131e 100644
--- a/Lib/_pydecimal.py
+++ b/Lib/_pydecimal.py
@@ -3391,7 +3391,7 @@ def logical_and(self, other, context=None):
         (opa, opb) = self._fill_logical(context, self._int, other._int)
 
         # make the operation, and clean starting zeroes
-        result = "".join([str(int(a)&int(b)) for a,b in zip(opa,opb)])
+        result = "".join(str(int(a)&int(b)) for a,b in zip(opa,opb))
         return _dec_from_triple(0, result.lstrip('0') or '0', 0)
 
     def logical_invert(self, context=None):
@@ -3415,7 +3415,7 @@ def logical_or(self, other, context=None):
         (opa, opb) = self._fill_logical(context, self._int, other._int)
 
         # make the operation, and clean starting zeroes
-        result = "".join([str(int(a)|int(b)) for a,b in zip(opa,opb)])
+        result = "".join(str(int(a)|int(b)) for a,b in zip(opa,opb))
         return _dec_from_triple(0, result.lstrip('0') or '0', 0)
 
     def logical_xor(self, other, context=None):
@@ -3432,7 +3432,7 @@ def logical_xor(self, other, context=None):
         (opa, opb) = self._fill_logical(context, self._int, other._int)
 
         # make the operation, and clean starting zeroes
-        result = "".join([str(int(a)^int(b)) for a,b in zip(opa,opb)])
+        result = "".join(str(int(a)^int(b)) for a,b in zip(opa,opb))
         return _dec_from_triple(0, result.lstrip('0') or '0', 0)
 
     def max_mag(self, other, context=None):
diff --git a/Lib/argparse.py b/Lib/argparse.py
index 8a12dea7668799..6ebf98beac1a14 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -287,9 +287,9 @@ def format_help(self):
         return help
 
     def _join_parts(self, part_strings):
-        return ''.join([part
-                        for part in part_strings
-                        if part and part is not SUPPRESS])
+        return "".join(
+            part for part in part_strings if part and part is not SUPPRESS
+        )
 
     def _format_usage(self, usage, actions, groups, prefix):
         if prefix is None:
@@ -621,7 +621,7 @@ def _expand_help(self, action):
             if hasattr(params[name], '__name__'):
                 params[name] = params[name].__name__
         if params.get('choices') is not None:
-            choices_str = ', '.join([str(c) for c in params['choices']])
+            choices_str = ", ".join(str(c) for c in params['choices'])
             params['choices'] = choices_str
         return self._get_help_string(action) % params
 
@@ -1588,9 +1588,9 @@ def _handle_conflict_error(self, action, conflicting_actions):
         message = ngettext('conflicting option string: %s',
                            'conflicting option strings: %s',
                            len(conflicting_actions))
-        conflict_string = ', '.join([option_string
-                                     for option_string, action
-                                     in conflicting_actions])
+        conflict_string = ", ".join(
+            option_string for option_string, action in conflicting_actions
+        )
         raise ArgumentError(action, message % conflict_string)
 
     def _handle_conflict_resolve(self, action, conflicting_actions):
@@ -2163,8 +2163,9 @@ def _match_arguments_partial(self, actions, arg_strings_pattern):
         result = []
         for i in range(len(actions), 0, -1):
             actions_slice = actions[:i]
-            pattern = ''.join([self._get_nargs_pattern(action)
-                               for action in actions_slice])
+            pattern = "".join(
+                self._get_nargs_pattern(action) for action in actions_slice
+            )
             match = _re.match(pattern, arg_strings_pattern)
             if match is not None:
                 result.extend([len(string) for string in match.groups()])
diff --git a/Lib/ast.py b/Lib/ast.py
index 18163d6b7bd163..6422a21b07c02d 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -323,13 +323,7 @@ def _splitlines_no_ff(source):
 
 def _pad_whitespace(source):
     r"""Replace all chars except '\f\t' in a line with spaces."""
-    result = ''
-    for c in source:
-        if c in '\f\t':
-            result += c
-        else:
-            result += ' '
-    return result
+    return "".join(c if c in "\f\t" else " " for c in source)
 
 
 def get_source_segment(source, node, *, padded=False):