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will be a dictionary with state abbreviations as its keys.

Each state abbreviation will map to another dictionary, whose keys are strings of the county names in that state.

state = sheet['B' str(row)].value county = sheet['C' str(row)].value pop = sheet['D' str(row)].value # TODO: Open a new text file and write the contents of county Data to it., which will contain the populations and number of tracts you calculate for each county.

Before you can store anything in it, though, you should determine exactly how you’ll structure the data inside it.

If you want, you can load a workbook, get a Say you have a spreadsheet of data from the 2010 US Census and you have the boring task of going through its thousands of rows to count both the total population and the number of census tracts for each county.

(A census tract is simply a geographic area defined for the purposes of the census.) Each row represents a single census tract.

If you have a newer version and want to see what additional features may be available to you, you can check out the full documentation for Open Py XL at data type is explained further in Chapter 16.

print('Reading rows...') ❹ for row in range(2, sheet.max_row 1): # Each row in the spreadsheet has data for one census tract.

Each county name will in turn map to a dictionary with just two keys, -- for row in range(2, sheet.max_row 1): # Each row in the spreadsheet has data for one census tract.

state = sheet['B' str(row)].value county = sheet['C' str(row)].value pop = sheet['D' str(row)].value dictionary will contain all of the population and tract information keyed by county and state.

As an alternative, you can also get a cell using the sheet’s does the reverse: You pass it the letter name of a column, and it tells you what number that column is.

You don’t need to have a workbook loaded to use these functions.

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