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Most of the time, the code should be written in such a way that it is easy to understand on its own. However, if you want to include a piece of information to explain a part of your code, you can use the
# sign. A line of text preceded by a # is called a comment. The machine does not run this code — it is only for humans to read. When you look back at your code later, comments may help you figure out what it was intended to do.
# this variable counts how many rows of the spreadsheet we have:
row_count = 131.
EXERCISE
1. Add a comment above the declaration of city_pop with a description of what you think the variable contains.
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