lec-27-notes.txt

open => returns a file object
 - path (review relative paths)
 - mode (just 'r' and 'w')
 - encoding

f.close() when you're done

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reading files:
 - read method
 - a file object is a generator

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writing files
 - write method
 - watch for newline!

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CSVs and JSON

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os helpers:
 - os.listdir
 - os.mkdir
 - os.path.exists
 - os.path.isdir
 - os.path.isfile
 - os.path.join

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Exceptions
 - permission denied: open('/test', 'w')
 - doesn't exist: open('bad.txt')
 - is a dir: open('/home')

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DEMOS
 - keep track of points in dict (JSON)
 - save user input to history
 - recursively search for filename
 - recursively search for data in files