The cost value should always be a float.
The per share calculation shouldn't be changed dramatically by being
a float, (except for potential rounding errors), but change to so
that PerShare and PerTrade are aligned.
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When the cost basis was set to an integer the division in the
calculation would floor down to the nearest integer.
Ensuring that the number is a float during PerTrade's init
will ensure that the calculation doesn't use integer division.
Do the conversion to float in init rather than calculate, so that
calling the builtin `float` is not added to any inner loops.
Mostly whitespace, line width and other spacing changes.
Also, removes use of deprecated has_key in favor of `in`
Going forward new patches should pass running `flake8` before
submission.
Eddie Hebert