round off to two decimal & return float

[ஆமாச்சு]

Consider the scenario,

>> a = 10
>> "{0:.2f}".format(a)
'10.00'

This returns a string 10.00. But what is the preferred method to retain
10.0 (float) as 10.00 (float)?

I am trying to assign the value to a cell of a spreadsheet, using
python-xlwt. I would like to have 10.00 as the value that is right
aligned. With text it is left aligned.

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Sri Ramadoss M