Answer 1

I found this:

"I would say Python. it helps me a lot in my job. I wrote my own scripts in extracting the acls from all devices for a give IP or sheet of Fqdn's. It has many module such as xlrd and xlwt through which I generate weekly reports from raw unformatted data. Frequently I help my friends who work in data analysis by extracting mass data from websites."

Source: https://www.quora.com/Which-programming-scripting-language-is-best-for-a-Network-Engineer

As an extra, here an article on how to become a network engineer:
http://www.rogerperkin.co.uk/career/become-network-engineer/

Answer 2

python3 has a few libraries that can be used for networking. Also it has a massive communitty support, meaning you'll get your answer quickly. I would recommend python.