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This question demonstrates how to use the \"Download a text file\" extension to create a link to download a file containing text created from question variables.

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The \"download a file\" extension makes it easy to provide a text file that the student should download.

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It provides a function download_link(filename, content, link_text). If you don't give link_text, the link reads \"Download filename\".

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Here's a text file containing the text \"Hello there\": {download_link(\"hi.txt\",\"Hello there\")}.

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Here's the same file, but with different link text: {download_link(\"hi.txt\",\"Hello there\",\"Your very own hello file\")}.

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And here's a text file containing a list of numbers, one on each line: {download_link(\"numbers.txt\",join(xs,\"\\n\"))}.

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The extension also provides a function csv(rows,headers). rows should be a list of lists of values. headers is an optional list of strings to put above the first row.

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Here's a table of data:

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{table_x_y_letter}

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As a CSV file, it looks like this:

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{x_y_letter_csv}
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{download_link(\"x-y-a.csv\",x_y_letter_csv)}

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Here's a CSV file with commas and quote characters in the entries, that are automatically escaped for you:

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{csv(zip(with_commas,with_quotes))}
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{download_link(\"with-weird-characters.csv\",csv(zip(with_commas,with_quotes)))}

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Or you can give a dictionary, mapping headers to columns:

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{csv([\"X\":xs,\"Y\":ys,\"weird data with commas\":with_commas])}
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{download_link(\"from-dictionary.csv\",csv([\"X\":xs,\"Y\":ys,\"weird data with commas\":with_commas]))}

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Or you can give a list of dictionaries. There's a column for each distinct key in the dictionaries.

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{csv(list_of_dicts)}
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{download_link(\"from-dictionary.csv\",csv(list_of_dicts))}

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