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InfluxDB
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plc-2.0
``plc`` is the public Planck Likelihood Code. It provides C and Fortran libraries that allow users to compute the log likelihoods of the temperature, polarization, and lensing maps. Optionally, it also provides a python version of this library, as well as tools to modify the predetermined options for some likelihoods (e.g. changing the high-ell and low-ell lmin and lmax values of the temperature).
What you want to do is use virtual environments. I recommend using Poetry. Follow the documentation there. What you'll do is install Python 2.7 into a virtual environment and then install Monte Python in that same environment. You do not want to replace your system Python.
Another suggestion would be to consider using a more modern package. Cobaya (https://github.com/CobayaSampler/cobaya) is one such package that would do what you want, but is much more modern and user friendly than MontePython.
The instructions you're trying to follow are out of date and refer to a release of the code from 2013. If you download the current version of MontePython (on github here) and follow the installation guide there you should find that it works fine with Python 3.
Likewise plc can be downloaded from here.