In [1]: ', '.join(['my', 'super', 'list'])
Out[1]: 'my, super, list'
In [2]: import os
In [3]: os.path.join('path', 'to', 'script')
Out[3]: 'path/to/script'
In [4]: os.path.abspath(os.path.join('path', 'to', 'script'))
Out[4]: '/home/username/path/to/script'
In [5]: os.path.abspath(os.path.join('/', 'path', 'to', 'script'))
Out[5]: '/path/to/script'
gridLineRenderer.material=new Material(Shader.Find("Unlit/Color"));