range feature suggestion for persistent graph

[narnolddd]

Since the at function on a persistent graph returns all active edges which were created before and deleted after a reference point (i.e. without a window) it might be nice to have a range function to complement the expanding and rolling. It might look something like

G = rp.PersistentGraph()

# insert some code adding and deleting edges...

# just specified by step size
for view in G.range(step="1 day"):
   # do some graphy thing

# with a start and end point
for view in G.range(start=G.earliest_time, step="1 day", end = G.latest_time):
   # do some graphy thing

but would be equivalent to

times = [ G.earliest_date_time + i*dt.timedelta("1 day") for i in range( some_number ) ]

for t in times:
   G_view = G.at(t)
   # do some graphy thing