style: use Walrus operator

copier/main.py

@@ -450,8 +450,7 @@ def _ask(self) -> None:
                 answer = question.parse_answer(result.init[var_name])
                 # Try to validate the answer value if the question has a
                 # validator.
-                err_msg = question.validate_answer(answer)
-                if err_msg:
+                if err_msg := question.validate_answer(answer):
                     raise ValueError(err_msg)
                 # At this point, the answer value is valid. Do not ask the
                 # question again, but set answer as the user's answer instead.

copier/template.py

@@ -203,8 +203,7 @@ class Template:
     use_prereleases: bool = False
 
     def _cleanup(self) -> None:
-        temp_clone = self._temp_clone()
-        if temp_clone:
+        if temp_clone := self._temp_clone():
             if sys.version_info >= (3, 12):
                 rmtree(
                     temp_clone,
@@ -226,11 +225,10 @@ def _temp_clone(self) -> Path | None:
         """
         if "local_abspath" not in self.__dict__:
             return None
-        clone_path = self.local_abspath
         original_path = Path(self.url).expanduser()
         with suppress(OSError):  # triggered for URLs on Windows
             original_path = original_path.resolve()
-        if clone_path != original_path:
+        if (clone_path := self.local_abspath) != original_path:
             return clone_path
         return None
 

copier/user_data.py

@@ -331,13 +331,11 @@ def _formatted_choices(self) -> Sequence[Choice]:
     def get_message(self) -> str:
         """Get the message that will be printed to the user."""
         if self.help:
-            rendered_help = self.render_value(self.help)
-            if rendered_help:
+            if rendered_help := self.render_value(self.help):
                 return force_str_end(rendered_help) + "  "
         # Otherwise, there's no help message defined.
         message = self.var_name
-        answer_type = self.get_type_name()
-        if answer_type != "str":
+        if (answer_type := self.get_type_name()) != "str":
             message += f" ({answer_type})"
         return message + "\n  "
 
@@ -387,8 +385,7 @@ def _validate(answer: str) -> str | Literal[True]:
             if lexer:
                 result["lexer"] = lexer
             result["multiline"] = self.get_multiline()
-            placeholder = self.get_placeholder()
-            if placeholder:
+            if placeholder := self.get_placeholder():
                 result["placeholder"] = placeholder
         if questionary_type in {"input", "checkbox"}:
             result["validate"] = _validate

copier/vcs.py

@@ -167,8 +167,7 @@ def clone(url: str, ref: str | None = None) -> str:
     _clone = git["clone", "--no-checkout", url, location]
     # Faster clones if possible
     if git_version >= Version("2.27"):
-        url_match = re.match("(file://)?(.*)", url)
-        if url_match is not None:
+        if url_match := re.match("(file://)?(.*)", url):
             file_url = url_match.groups()[-1]
         else:
             file_url = url