I have written a backtrack search for objects in sagemath. I do not know how many it will find and I would like to write them to a file as I find them with
F.write(dumps(new_solution))
How can I read them all back in? Something like this solution in python.
I'm not sure if this is what you're trying to do:
sage: a = [2/3, 3/4, 5/6]
sage: for x in a:
....: with open('results', 'wb') as F:
....: F.write(dumps(a))
....:
sage: with open('results', 'rb') as F:
....: B = loads(F.read())
....:
sage: B
[2/3, 3/4, 5/6]
I tried to use dumps() and loads() to do this in quite a few ways with no luck. I then decided to try it exactly as in the python solution that I link to in the question which works fine. Before the search I open a file for binary writing
f = open("results",'wb')
which is then passed to the search. When I find a solution in the backtrack search I simply call
pickle.dump(new_solution,f)
and then close the file when the search is complete.
To read everything back in I have
f = open("results", "rb")
results = []
try:
while(True):
result = pickle.load(f)
results.append(temp)
except EOFError:
print("end of file reached")
Asked: 2023-04-04 19:58:44 +0100
Seen: 422 times
Last updated: Apr 07 '23
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