Inconsistent usage of percentage weights

[fja05680]

I think there are issues/bugs inside Portfolio.adjust_percents. This could have been a pull request, but I'd rather have a discussion in case I'm mistaken. I'll walk through what I think are the problems.

def adjust_percents(self, date, prices, weights, row, directions=None):
w = {}

    # Get current weights
    for symbol in self.symbols:
        w[symbol] = self.share_percent(row, symbol)

Weights in other functions are converted between whole numbers and floats. We don't know if the user is passing in whole numbers or floats yet. Later sorting will fail if there's a mismatch. I think this should be something like:

convert_weight = lambda weight: self._float(weight) if weight <= 1 else self._float(weight) / self._float(100)
weights = {symbol: convert_weight(weight) for symbol, weight in weights.items()}

w = {}

Get current weights

for symbol in self.symbols:
w[symbol] = convert_weight(self.share_percent(row, symbol, field=field))