Python Notes

1. Booleans
The numbers 0, 0.0, and 0+0j are all False; any other number is True.
The empty string "" is False; any other string is True.
The empty list [] is False; any other list is True.
The empty dictionary {} is False; any other dictionary is True.
The empty set set() is False; any other set is True.
The special Python value None is always False.

2. Working on REPL
Import library
>>> from autoinfra.resource import Client, Ddr, Resource
List all available methods
>>> dir(Client)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_connect_ssh', 'bring_up_eth', 'configure_ip', 'eth_filter', 'get_eths_details', 'get_eths_via_ifconfig', 'get_eths_via_ip_a', 'get_switch_port_details', 'is_connected', 'is_eth_link_detected', 'send_cmd']
Access docstring on a method
>>> help(Client.get_switch_port_details)

3. Testing
From this post.

$ pip install nose

From root of project run nosetests, this would look for any test under this directory and run it
$ pwd
/auto/home13/delacs/Documents/projects/nextgen/libs/autoinfra
$ nosetests
.....
----------------------------------------------------------------------
Ran 5 tests in 2.659s
OK

To run a single file
$ nosetests -v autoinfra/resources/tests/test_ddr.py
test_get_10g_eths (test_ddr.TestDdr) ... ok
test_se_cmd (test_ddr.TestDdr) ... ok
test_send_cmd (test_ddr.TestDdr) ... ok
----------------------------------------------------------------------
Ran 3 tests in 2.602s

To run a particular test in a file
$ nosetests -v autoinfra/switches/tests/test_cisco.py:TestCisco.test_move_to_vlan_no_nxapi_single
test_move_to_vlan_no_nxapi_single (test_cisco.TestCisco) ... ok
----------------------------------------------------------------------
Ran 1 test in 12.423s
OK

This works when test files have imports like this...
from autoinfra.resources.client import Client

4. Install python 2.7.12 on another directory (/opt/python)
# wget https://www.python.org/ftp/python/2.7.12/Python-2.7.12.tgz
# tar zxf Python-2.7.12.tgz
# cd Python-2.7.12/
# ./configure --prefix=/opt/python
# make
# make install

5. Create a virtual environment
$ sudo yum install python-virtualenv
$ mkdir sample_project
$ cd sample_project
$ virtualenv -p /opt/python/bin/python2.7 .venv

6. Data dumper
>>> from pprint import pprint
>>> pprint(vars(Host.objects.get(name="w3-perfsds-0001")))