How to work with large lists without crashing Python?

[wavic]

Put the data into a file. Let's call it data.txt.

with open('data.txt', 'r') as data:
    for line in data:
        # do something

Here is how you read from a file. You create a file object called data and iterate over each line. The 'r' parameter is for reading.
To write to a file you do almost the same.

with open('some_file.txt', 'w') as output: # this time in 'w' (write) mode
    for element in iterable:
        output.write(element)

The with statement is called context manager and it will close the file automatically when its code block is executed. You can stack them.

with open('file_one.txt', 'r') as r:
    with open('file_two.txt', 'w') as w:
        for line in r:
            w.write(line)

This read from one file and write to another. Basically, it's copying the file.