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From your question I'm guessing you have installed Sage on your computer and you are running it in notebook mode.

It seems you program takes a long time to run, and outputs a lot of data. In such a case it is a good idea to output to a file rather than outputting to the screen, for two reasons:

• printing to the screen takes time! Your program will run faster if it prints nothing to the screen.

• in the program crashes, you at least get whatever was written to a file until then.

Writing to a file is simple in Python. See the following selection of links: lecture notes, ask-sage, stackoverflow.