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How do you open an already existing file and add content to it?
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Answer / Mrs Arati Hyanki
To open an existing file in write mode (which creates the file if it doesn't exist) and append data to its end, use `open(filename, 'a')`. To write a string to the file, use the write() method. For example: `with open('myfile.txt', 'a') as f:nt f.write('New line of text.n')`.
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