Answer 1

All depends on what you intend to work with, some of them listed below can be easily searched

http://blog.stoneriverelearning.com/20-great-JUMP_LINK__&&__python__&&__JUMP_LINK-libraries-you-must-know/
http://noeticforce.com/best-python-libraries
https://www.dunebook.com/7-best-python-libraries-of-2017/
http://www.discoversdk.com/blog/10-interesting-python-modules-to-learn-in-2016
https://www.infoworld.com/article/3164409/application-development/hidden-gems-14-python-libraries-too-good-to-overlook.html

many more........