infra/helper.py broken in Python 2

[cmeister2]

Hi,

Commit f533434 introduced a number of os.makedirs(directory, exist_ok=True) calls. As per https://docs.python.org/2.7/library/os.html and https://docs.python.org/3.5/library/os.html, exist_ok was added in 3.2.

This broke the CI checking here: libsndfile/libsndfile#663 with the error:

TypeError: makedirs() got an unexpected keyword argument 'exist_ok'

Not sure if this was the intention or not - and I don't mind fixing up our code to use python 3 to execute the script instead of python 2. If the intention is that python 3 is the default now, perhaps the shebang of infra/helper.py should be updated from

#!/usr/bin/env python

to

#!/usr/bin/env python3
```?

[jonathanmetzman]

Thanks for letting know about this. I'm going to change this code to work with python2 again.
@oliverchang Do you think we should just switch to python3?
I wonder if there's something like caniuse.com for python versions that we can use to find out which distros/OSes have python3.