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Hello,
I would create a file that contains a number and then read it from Sage. To open a file this is a standard python command (see Input and Output from python.org):
sage: f = open("my_file_that_contains_a_big_number.txt")
sage: text = f.read()
sage: f.close()
sage: my_big_number = ZZ(text)
If it is multiple lines you can remove the breaks with
sage: f = open("my_file_that_contains_a_big_number.txt")
sage: text = f.read()
sage: f.close()
sage: text = text.replace("\n", "")
sage: text = text.replace("\r", "")
sage: text = text.replace(" ", "")
sage: my_big_number = ZZ(text)
Vincent
