To install kind of vanilla version rna-tools by use pip:

$ pip install rna-tools

Test if the package is installed:

$ python -c 'import rna_tools'

if nothing appears that’s good. If you see this:

$ python -c 'import rna_tools'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named rna_tools

then go to custom installation: <>