How to upgrade networkx to developer version in Linux

Weight functions are only available on networkx development version.
To install it you need to do the following:

 git clone https://github.com/networkx/networkx.git
cd networkx
sudo python setup.py install
nosetest

 ERROR: Failure: ImportError (No module named coverage)
ImportError: No module named pandas

 To fix it, install these libraries and re-run nesetest:

 sudo pip install pandas coverage
nosetests
----------------------------------------------------------------------
Ran 3045 tests in 33.191s
OK (SKIP=7)

 If you run your python console you can ask for networkx version as follows:

 python                
Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import networkx
>>> print networkx.__version__

2.0.dev_20170321173742

But, if you run your code it still be using version 1.1
Now you need to remove the previous version and re-install the last version:

sudo pip uninstall networkx
sudo python setup.py install

Enjoy it!

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