[9481] Change DelayedCall repr to include details

src/twisted/internet/base.py

@@ -47,7 +47,7 @@ class DelayedCall:
     # enable .debug to record creator call stack, and it will be logged if
     # an exception occurs while the function is being run
     debug = False
-    _str = None
+    _repr = None
 
     def __init__(self, time, func, args, kw, cancel, reset,
                  seconds=runtimeSeconds):
@@ -101,7 +101,7 @@ def cancel(self):
             self.canceller(self)
             self.cancelled = 1
             if self.debug:
-                self._str = str(self)
+                self._repr = repr(self)
             del self.func, self.args, self.kw
 
     def reset(self, secondsFromNow):
@@ -181,9 +181,15 @@ def __lt__(self, other):
         return self.time < other.time
 
 
-    def __str__(self):
-        if self._str is not None:
-            return self._str
+    def __repr__(self):
+        """
+        Implement C{repr()} for L{DelayedCall} instances.
+
+        @rtype: C{str}
+        @returns: String containing details of the L{DelayedCall}.
+        """
+        if self._repr is not None:
+            return self._repr
         if hasattr(self, 'func'):
             # This code should be replaced by a utility function in reflect;
             # see ticket #6066:

src/twisted/internet/test/test_base.py

@@ -242,7 +242,17 @@ def test_str(self):
         self.assertEqual(
             str(dc),
             "<DelayedCall 0x%x [10.5s] called=0 cancelled=0 nothing(3, A=5)>"
-                % (id(dc),))
+            % (id(dc),),
+        )
+
+
+    def test_repr(self):
+        """
+        The string representation of a L{DelayedCall} instance, as returned by
+        {repr}, is identical to that returned by L{str}.
+        """
+        dc = DelayedCall(13, nothing, (6, ), {"A": 9}, None, None, lambda: 1.6)
+        self.assertEqual(str(dc), repr(dc))
 
 
     def test_lt(self):

src/twisted/newsfragments/9481.feature

@@ -0,0 +1 @@
+The repr() of a twisted.internet.base.DelayedCall now encodes the same information as its str(), exposing details of its scheduling and target callable.