cpython: 691fba640266 (original) (raw)

Mercurial > cpython

changeset 100605:691fba640266

Issue #26567: enhance ResourceWarning example [#26567]

Victor Stinner victor.stinner@gmail.com
date	Sat, 19 Mar 2016 10:33:25 +0100
parents	543639cdfdb9
children	71c55c89d4f1
files	Doc/whatsnew/3.6.rst
diffstat	1 files changed, 12 insertions(+), 9 deletions(-)[+] [-] Doc/whatsnew/3.6.rst 21

line wrap: on

line diff

--- a/Doc/whatsnew/3.6.rst +++ b/Doc/whatsnew/3.6.rst @@ -272,24 +272,27 @@ used to try to retrieve the traceback wh Example with the script example.py::

import warnings

+ def func():

```
   f = open(__file__)[](#l1.10)
```
```
   f = None[](#l1.11)
```

```
   return open(__file__)[](#l1.12)
```

func()

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[](#l1.24)
```
```
   f = open(__file__)[](#l1.25)
```
```
 File "example.py", lineno 5[](#l1.26)
```
```
   func()[](#l1.27)
```

```
 File "example.py", lineno 4[](#l1.28)
```
```
   return open(__file__)[](#l1.29)
```
```
 File "example.py", lineno 6[](#l1.30)
```
```
   f = func()[](#l1.31)
```

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. zipfile