bipy/pyqi — pull request #208 by gregcaporaso (2013-12-02 18:42:44+00:00)
Title: added dry_run parameter. fixes #207

```
>>> from pyqi.util import pyqi_system_call

>>> pyqi_system_call('ls -la')
('total 64\ndrwxr-xr-x 16 caporaso staff 544 Dec 2 11:32 .\ndrwxr-xr-x 310 caporaso staff 10540 Dec 2 10:13 ..\ndrwxr-xr-x 16 caporaso staff 544 Dec 2 11:40 .git\n-rw-r--r-- 1 caporaso staff 54 Aug 3 13:25 .gitattributes\n-rw-r--r-- 1 caporaso staff 265 Aug 26 12:59 .gitignore\n-rw-r--r--@ 1 caporaso staff 2071 Aug 26 12:59 COPYING.txt\n-rw-r--r-- 1 caporaso staff 232 Dec 2 11:32 ChangeLog.md\n-rw-r--r-- 1 caporaso staff 177 Oct 30 11:29 MANIFEST.in\n-rw-r--r--@ 1 caporaso staff 1260 Aug 26 12:59 README.md\ndrwxr-xr-x 4 caporaso staff 136 Aug 4 13:48 build\ndrwxr-xr-x 11 caporaso staff 374 Oct 4 10:11 doc\ndrwxr-xr-x 12 caporaso staff 408 Dec 2 11:41 pyqi\ndrwxr-xr-x 3 caporaso staff 102 Oct 4 10:11 scripts\n-rw-r--r-- 1 caporaso staff 3246 Dec 2 11:32 setup.py\ndrwxr-xr-x 5 caporaso staff 170 Aug 6 07:16 tests\n-rw-r--r-- 1 caporaso staff 67 Oct 30 11:29 tox.ini\n', '', 0)

>>> pyqi_system_call('ls -la',dry_run=True)
ls -la
('', '', 0)

>>>
```