Playing around with some census data - Jim Mahoney, Jan 2020

* data source
 
    http://www.us-census.org/
    http://us-census.org/pub/usgenweb/census/vt/windham/1850/

* files

    vernon_1850.txt           copy of index.txt from http://...windham/1850/
    vernon_1850_edited.txt    same with header lines removed
    convert_windham1850.py    script to produce .csv from ...edited.txt
    vernon_1850.csv           csv file with lastname,firstname,age
    chap2.html                jupyter notebook which finds average of ages
    chap2.ipynb               ditto

* notes

    The ages are mostly integers, but there are a few fractions,
    such as "9/12". Though it isn't documented anywhere I can see,
    I can only make sense of these as the age in months,
    i.e. 9/12 of a year.

    I used this to look at the python syntax in chapter 2
    of "Data Science from Scratch".