Why does the correct answer require strings be wrapped with " rather than ' in mission 137-9?

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#1

Hi, I am confused about the behavior of code in mission 137-9.

When I use the following code, I get an empty dataframe:

data['graduation'] = data['graduation'][data['graduation']['Cohort'] == '2006']
data['graduation'] = data['graduation'][data['graduation']['Demographic'] == 'Total  Cohort']
print(data['graduation'].head())

however, when I replace my single quotes with double-quotes, I get the correct answer:

data["graduation"] = data["graduation"][data["graduation"]["Cohort"] == "2006"]
data["graduation"] = data["graduation"][data["graduation"]["Demographic"] == "Total Cohort"]
print(data["graduation"].head())

Can someone please explain this behavior? From what I’ve been able to find, these should be interchangeable?

#2

It looks like in the first version that there are two spaces between Total and Cohort. Can you check to see if that’s the issue?

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#3

That was the issue! Thanks, somehow I totally missed that!

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