bpo-32262: Fix codestyle; use f-strings formatting where necessary. (#4775)

Lib/asyncio/queues.py

@@ -1,6 +1,4 @@
-"""Queues"""
-
-__all__ = ['Queue', 'PriorityQueue', 'LifoQueue', 'QueueFull', 'QueueEmpty']
+__all__ = ('Queue', 'PriorityQueue', 'LifoQueue', 'QueueFull', 'QueueEmpty')
 
 import collections
 import heapq
@@ -10,16 +8,12 @@ from . import locks
 
 
 class QueueEmpty(Exception):
-    """Exception raised when Queue.get_nowait() is called on a Queue object
-    which is empty.
-    """
+    """Raised when Queue.get_nowait() is called on an empty Queue."""
     pass
 
 
 class QueueFull(Exception):
-    """Exception raised when the Queue.put_nowait() method is called on a Queue
-    object which is full.
-    """
+    """Raised when the Queue.put_nowait() method is called on a full Queue."""
     pass
 
 
@@ -73,22 +67,21 @@ class Queue:
                 break
 
     def __repr__(self):
-        return '<{} at {:#x} {}>'.format(
-            type(self).__name__, id(self), self._format())
+        return f'<{type(self).__name__} at {id(self):#x} {self._format()}>'
 
     def __str__(self):
-        return '<{} {}>'.format(type(self).__name__, self._format())
+        return f'<{type(self).__name__} {self._format()}>'
 
     def _format(self):
-        result = 'maxsize={!r}'.format(self._maxsize)
+        result = f'maxsize={self._maxsize!r}'
         if getattr(self, '_queue', None):
-            result += ' _queue={!r}'.format(list(self._queue))
+            result += f' _queue={list(self._queue)!r}'
         if self._getters:
-            result += ' _getters[{}]'.format(len(self._getters))
+            result += f' _getters[{len(self._getters)}]'
         if self._putters:
-            result += ' _putters[{}]'.format(len(self._putters))
+            result += f' _putters[{len(self._putters)}]'
         if self._unfinished_tasks:
-            result += ' tasks={}'.format(self._unfinished_tasks)
+            result += f' tasks={self._unfinished_tasks}'
         return result
 
     def qsize(self):