Outline for October 20, 2021

Reading: §7
Due: Homework 2, due October 20, 2021

1. Files
   1. What is a file?
   2. What can you do with it? (For example, read, write, append)
   3. Types of files (text, binary)

2. File Input and Output for text files
   1. Opening and closing: open(filename, mode), close()
   2. Reading: readline(), readlines(), read(), read(n)
   3. Writing: write(str), writelines(list)

3. Exception EOFError — input function encounters an end of file

4. Examples
   1. Print out a named file [fileio1.py]
   2. Print out a named file and prepend line numbers [fileio2.py]
   3. Store the output in filename.lst [fileio3.py]

5. Examples
   1. Put lines in a file in random order [randlines.py]
   2. Read in a list of words from a file, then search it as requested; similar to linear search program [search-1.py]
   3. Now see how many words you checked total [search-1c.py]

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: [email protected]

ECS 235A, Computer and Information Security Version of October 21, 2021 at 12:22PM

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