def mavg(entries, lookback):
"""
Returns two lists, one for each of x_axis and y_axis where the
y axis is a calculated moving average of the given count.
"""
logged, x, y = [], [], []
for e in entries:
logged.append(e)
if len(logged) < lookback:
continue
x.append(e.date)
sample = [float(e.value) for e in logged[-lookback:]]
assert len(sample) == lookback
y.append(avg(sample))
return x, y
def _mavg(self, num):
"""Calculates the average of the last num entries."""
i = self._index()
if len(self._parent_entries()) > num and i:
return avg([float(e.value)
for e in self._parent_entries()[i-num:i]])
