Learn Python the Hard Way: A Deceptively Simple Introduction to the Terrifyingly Beautiful World of Computers and Data Science, 5th Edition

Exercise 17

More Files

Now let’s do a few more things with files. We’ll write a Python script to copy one file to another. It’ll be very short but will give you ideas about other things you can do with files.

Listing 17.1: ex17.py

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 1   from sys import argv
 2   from os.path import exists
 3
 4   from_file = "test.txt"
 5   to_file = "new_test.txt"
 6
 7   print(f"Copying from {from_file} to {to_file}")
 8
 9   # we could do these two on one line, how?
10   in_file = open(from_file)
11   indata = in_file.read()
12
13   print(f"The input file is {len(indata)} bytes long")
14
15   print(f"Does the output file exist? {exists(to_file)}")
16   print("Ready, hit RETURN to continue, CTRL-C to abort.")
17   input()
18
19   out_file = open(to_file, 'w'