latex, minted and pygmentize

The minted package of LaTeX uses the Python module "pygmentize" to colour the code snippets.
From time to time, this could arise:

```
para@N551JK-ULB:~/Documents/ULB/ELECH310/2015-2016/examen/exam_test_cls$ pygmentize
Traceback (most recent call last):
  File "/usr/local/bin/pygmentize", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
    @_call_aside
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 637, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'Pygments==2.1' distribution was not found and is required by the application
```

Upgrading pygmentize won't do it, the script is broken. You need to locate it and manually change the "pygments" version to the one you have installed on your system (in my case 2.1.3 instead of the 2.1 required in the script).

```
$ pip freeeze
...
Pygments==2.1.3
...
$ sudo vim `which pygmentize`
```

Now it works.