String formatting in Python 3
https://docs.python.org/3/library/string.html#formatstrings
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Content below this fold was written in 2014/15 so take it with a grain of salt.
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To learn Python, you should probably start out by checking out the "Getting Started" page over at python.org https://www.python.org/about/gettingstarted/
http://www.tutorialspoint.com/python/
http://greenteapress.com/ offers free texts including [http://greenteapress.com/thinkpython/thinkpython.html Think Python]
MIT has a course in it's OpenCourseWare site called [http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-189-a-gentle-introduction-to-programming-using-python-january-iap-2011 introduction to programming using Python]