Use f-strings instead of %-style formatting.

Author: jonathanslenders

examples/asyncio-python-embed.py

@@ -25,7 +25,7 @@ async def print_counter() -> None:
     Coroutine that prints counters and saves it in a global variable.
     """
     while True:
-        print("Counter: %i" % counter[0])
+        print(f"Counter: {counter[0]}")
         counter[0] += 1
         await asyncio.sleep(3)
 

examples/asyncio-ssh-python-embed.py

@@ -44,8 +44,8 @@ async def main(port: int = 8222) -> None:
     def create_server() -> MySSHServer:
         return MySSHServer(lambda: environ)
 
-    print("Listening on :%i" % port)
-    print('To connect, do "ssh localhost -p %i"' % port)
+    print(f"Listening on: {port}")
+    print(f'To connect, do "ssh localhost -p {port}"')
 
     await asyncssh.create_server(
         create_server, "", port, server_host_keys=["/etc/ssh/ssh_host_dsa_key"]

ptpython/layout.py

@@ -108,7 +108,7 @@ def append_category(category: OptionCategory[Any]) -> None:
             tokens.extend(
                 [
                     ("class:sidebar", "  "),
-                    ("class:sidebar.title", "   %-36s" % category.title),
+                    ("class:sidebar.title", f"   {category.title:36}"),
                     ("class:sidebar", "\n"),
                 ]
             )
@@ -130,7 +130,7 @@ def goto_next(mouse_event: MouseEvent) -> None:
             sel = ",selected" if selected else ""
 
             tokens.append(("class:sidebar" + sel, " >" if selected else "  "))
-            tokens.append(("class:sidebar.label" + sel, "%-24s" % label, select_item))
+            tokens.append(("class:sidebar.label" + sel, f"{label:24}", select_item))
             tokens.append(("class:sidebar.status" + sel, " ", select_item))
             tokens.append(("class:sidebar.status" + sel, f"{status}", goto_next))
 
@@ -332,7 +332,7 @@ def get_continuation(
             width: int, line_number: int, is_soft_wrap: bool
         ) -> StyleAndTextTuples:
             if python_input.show_line_numbers and not is_soft_wrap:
-                text = ("%i " % (line_number + 1)).rjust(width)
+                text = f"{line_number + 1} ".rjust(width)
                 return [("class:line-number", text)]
             else:
                 return to_formatted_text(get_prompt_style().in2_prompt(width))
@@ -368,8 +368,7 @@ def get_text_fragments() -> StyleAndTextTuples:
         append(
             (
                 TB,
-                "%i/%i "
-                % (python_buffer.working_index + 1, len(python_buffer._working_lines)),
+                f"{python_buffer.working_index + 1}/{len(python_buffer._working_lines)} ",
             )
         )
 
@@ -492,8 +491,7 @@ def toggle_sidebar(mouse_event: MouseEvent) -> None:
         ("class:status-toolbar", " - "),
         (
             "class:status-toolbar.python-version",
-            "%s %i.%i.%i"
-            % (platform.python_implementation(), version[0], version[1], version[2]),
+            f"{platform.python_implementation()} {version[0]}.{version[1]}.{version[2]}",
         ),
         ("class:status-toolbar", " "),
     ]

ptpython/printer.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import sys
 import traceback
 from dataclasses import dataclass
 from enum import Enum

ptpython/repl.py

@@ -362,7 +362,7 @@ async def eval_async(self, line: str) -> object:
 
     def _store_eval_result(self, result: object) -> None:
         locals: dict[str, Any] = self.get_locals()
-        locals["_"] = locals["_%i" % self.current_statement_index] = result
+        locals["_"] = locals[f"_{self.current_statement_index}"] = result
 
     def get_compiler_flags(self) -> int:
         return super().get_compiler_flags() | PyCF_ALLOW_TOP_LEVEL_AWAIT