# Using PyROOT

When the environment variables for Uranie and PyROOT are properly set, we can access to the classes as follows:

{{
    "```{" "literalinclude" "} " + parent_dir +
        "/roottest/uranie/doc/overview/python/example_pyroot.py\n" +
        ":language: python\n"
        ":lines: 1-2,12-22,24-25,27-28\n"
    "```"
}}

This code should produce a graphic as the one displayed in [](#overview_example_pyroot)

{{
    "```{" "figure" "} " + parent_dir +
        "/roottest/build/uranie/doc/overview/python/example_pyroot.png\n"
    ":name: overview_example_pyroot\n"
    + figure_scale + "\n"
    "\n"
    "Histogram produced using PyROOT\n"
    "```"
}}

The instructions above can be executed either through the Python command line, or be written in a 
file (*myscript.py* in the example below) and run using the command:

```bash
python -i myscript.py
```

The *-i* option allows to stay in the Python environment at the end of the execution. This prevents 
the produced image to be automatically closed.