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Chapter 16
There’s a slight change to Exercise 16-1.
Pygal has been updated recently, which is a good thing; you’re learning a library that’s being steadily improved. If you’re using the latest version of Pygal, you’ll need to make some slight changes to the code in Chapter 16.
You can easily install a version of Pygal that allows the code in the book to run exactly as it’s written.
The first part of this update will tell you what to look for as you work through the section Mapping Global Data Sets: JSON Format, which begins on page 362. The second part will give you a page by page update.
Updates
Exercise 16-1: San Francisco
You can still get historical weather data from Weather Underground in the CSV format, but the link to the CSV file is not visible on the screen. To get historical weather data, go to the Weather Underground home page, click on the Menu on the right side of the screen, and click on Historical Weather. Enter a location, pick a starting date, and click Submit. A summary for this date will appear, with several tabs. Click on Custom, enter an end date on the next page, and click Get History.
If you scroll down you’ll see the weather data for the range you requested, in a neatly formatted table. To get the CSV version of this data, append &format=1 to the URL in your browser’s address bar. You can do this by clicking in the address bar, pressing Ctrl-End, typing &format=1, and pressing Enter. Your URL should look something like this:
Once you see the data in CSV format you can either use the Save As dialog from your browser, or you can copy the data and paste it into a text editor to save it. It’s good practice to use the .csv file extension when saving this kind of file.
The pygal_maps_world package
The dictionary COUNTRIES and the world map module have been moved to a separate package called pygal_maps_world. Here’s how to install this package:
$ pip install --user pygal_maps_world
On Windows, this is:
$ python -m pip install --user pygal_maps_world
countries.py, country_codes.py
The dictionary COUNTRIES needs to be imported from pygal_maps_world now:
from pygal.maps.world import COUNTRIES
world_populations.py, americas.py, na_populations.py
Pygal’s world map has been moved and renamed, so these progams need an additional import statement. This update also affects one other line of code. Add the following import statement near the top of the file:
from pygal.maps.world import World
In the line that creates the world map, change Worldmap to World:
wm = World()
Page by page updates
In the following sections, bold lines of code differ from the code that appears in the book:
p. 365, countries.py and country_codes.py
Use from pygal.maps.world import COUNTRIES instead of from pygal.i18n import COUNTRIES.
p. 367, americas.py
Use from pygal.maps.world import World instead of import pygal.
Use wm = World() instead of wm = pygal.Worldmap().
p. 368, na_populations.py
Use from pygal.maps.world import World instead of import pygal.
Use wm = World() instead of wm = pygal.Worldmap().
p. 369-370, world_populations.py
Use from pygal.maps.world import World instead of import pygal.
Use wm = World() instead of wm = pygal.Worldmap().