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ResourceWarning when reading ascii tables

See original GitHub issue

Using an example ecsv file from the astropy documentation:

# %ECSV 0.9
# ---
# datatype:
# - {name: a, unit: m / s, datatype: int64, format: '%03d'}
# - {name: b, unit: km, datatype: int64, description: This is column b}
a b
001 2
004 3

(although this works for anything I tried, including rdb files) when I try to read it with a python with warnings enabled (e.g. python -Wd) I get a resource warning:

>>> Table.read("test.ecsv")
/Users/timj/work/lsstsw3/miniconda/envs/lsst-scipipe/lib/python3.7/site-packages/astropy/io/ascii/connect.py:37: ResourceWarning: unclosed file <_io.TextIOWrapper name='test.ecsv' encoding='UTF-8'>
  return read(filename, format=format, **kwargs)
<Table length=2>
  a     b  
m / s   km 
int64 int64
----- -----
  001     2
  004     3

Specifying the format on the read does not trigger a warning:

>>> Table.read("test.ecsv", format="ascii.ecsv")
<Table length=2>
  a     b  
m / s   km 
int64 int64
----- -----
  001     2
  004     3

and neither does using astropy.io.ascii.read directly. So far “ascii.rdb” also behaves like this but “ascii.latex” does not.

Issue Analytics

State:
Created 4 years ago
Comments:13 (13 by maintainers)

Top GitHub Comments

1reaction

timjcommented, May 7, 2019

Fast reader does not seem to be the issue:

>>> t = Table.read("test.ecsv", fast_reader=False)
/Users/timj/work/lsstsw3/miniconda/envs/lsst-scipipe/lib/python3.7/site-packages/astropy/io/ascii/connect.py:37: ResourceWarning: unclosed file <_io.TextIOWrapper name='test.ecsv' encoding='UTF-8'>
  return read(filename, format=format, **kwargs)

0reactions

bnavigatorcommented, Oct 22, 2020

These messages still appear when testing 4.1:

[  359s] io/ascii/tests/test_connect.py::test_read_csv
[  359s]   /usr/lib/python3.8/site-packages/astropy/io/ascii/connect.py:18: ResourceWarning: unclosed file <_io.TextIOWrapper name='/usr/lib/python3.8/site-packages/astropy/io/ascii/tests/data/simple_csv.csv' encoding='UTF-8'>
[  359s]     return read(filename, **kwargs)
[  359s] 
[  359s] io/ascii/tests/test_connect.py::test_auto_identify_ecsv
[  359s]   /usr/lib/python3.8/site-packages/astropy/io/ascii/connect.py:18: ResourceWarning: unclosed file <_io.TextIOWrapper name='/tmp/pytest-of-abuild/pytest-0/popen-gw0/test_auto_identify_ecsv0/tmpFile.ecsv' encoding='UTF-8'>
[  359s]     return read(filename, **kwargs)
[  359s] 
[  359s] io/ascii/tests/test_ecsv.py::test_round_trip_masked_table_default
[  359s]   /usr/lib/python3.8/site-packages/astropy/io/ascii/connect.py:18: ResourceWarning: unclosed file <_io.TextIOWrapper name='/tmp/pytest-of-abuild/pytest-0/popen-gw0/test_round_trip_masked_table_d0/test.ecsv' encoding='UTF-8'>
[  359s]     return read(filename, **kwargs)

And more of the same type for many different file type tests.