ImportError: No module named 'StringIO' for python3

[PatrickDekker98]

executive_smach_visualization/smach_viewer/scripts/smach_viewer.py

Line 44 in 0d0d432

import StringIO

This line gives ModuleNotFoundError: No module named 'StringIO' in python3

From https://docs.python.org/3.0/whatsnew/3.0.html

The StringIO and cStringIO modules are gone. Instead, import the io module and use io.StringIO or io.BytesIO for text and data respectively.

possible solution:

try:
    import StringIO 
except ImportError:
    from io import StringIO 

[rafiepourfatemeh]

from io import StringIO