Chris Hill-Scott 55d4810c4b Don’t convert Excel reports to CSV before output ...

Converting Python data to CSV makes every field a string. This means
that in the report we return to the user every field will be a string,
even if it’s come from an `int` type in Python. This is because the CSV
‘standard’ doesn’t support any kind of typing.

Excel does support types for fields, so we can make our reports more
useful by preserving these types. This is particularly relevant in the
report we generate for performance platform, which needs the `count`
column to be a number type.

This commit adds extra code paths to the `Spreadsheet` class which mean
that it can be instantiated from either CSV data or a list of Python
data. Previously we were converting the Python data to CSV as an
intermediate step, before instantiating the class.

2019-05-07 16:07:23 +01:00

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