Issue #26567: enhance ResourceWarning example
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index b709917..1129cb3 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -272,24 +272,27 @@
Example with the script ``example.py``::
- def func():
- f = open(__file__)
- f = None
+ import warnings
- func()
+ def func():
+ return open(__file__)
+
+ f = func()
+ f = None
Output of the command ``python3.6 -Wd -X tracemalloc=5 example.py``::
- example.py:3: ResourceWarning: unclosed file <...>
+ example.py:7: ResourceWarning: unclosed file <_io.TextIOWrapper name='example.py' mode='r' encoding='UTF-8'>
f = None
Object allocated at (most recent call first):
- File "example.py", lineno 2
- f = open(__file__)
- File "example.py", lineno 5
- func()
+ File "example.py", lineno 4
+ return open(__file__)
+ File "example.py", lineno 6
+ f = func()
The "Object allocated at" traceback is new and only displayed if
-:mod:`tracemalloc` is tracing Python memory allocations.
+:mod:`tracemalloc` is tracing Python memory allocations and if the
+:mod:`warnings` was already imported.
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