1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
.. _default_arguments:
Default Arguments
=================
Many times, you want to override the default arguments of all commands launched
through sh. For example, suppose you want the output of all commands to be
aggregated into a :class:`io.StringIO` buffer. The naive way would be this:
.. code-block:: python
import sh
from io import StringIO
buf = StringIO()
sh.ls("/", _out=buf)
sh.whoami(_out=buf)
sh.ps("auxwf", _out=buf)
Clearly, this gets tedious quickly. Fortunately, we can create execution
contexts that allow us to set default arguments on all commands spawned from
that context:
.. code-block:: python
import sh
from io import StringIO
buf = StringIO()
sh2 = sh.bake(_out=buf)
sh2.ls("/")
sh2.whoami()
sh2.ps("auxwf")
Now, anything launched from ``sh2`` will send its output to the ``StringIO``
instance ``buf``.
|
