June 2017
Beginner
320 pages
7h 37m
English
book
Learn Python 3 the Hard Way: A Very Simple Introduction to the Terrifyingly Beautiful World of Computers and Code
by Zed A. Shaw
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Exercise 20. Functions and Files
Remember your checklist for functions, then do this exercise paying close attention to how functions and files can work together to make useful stuff.
ex20.py
1 from sys import argv 2 3 script, input_file = argv 4 5 def print_all(f): 6 print(f.read()) 7 8 def rewind(f): 9 f.seek(0)1011 def print_a_line(line_count, f):12 print(line_count, f.readline())1314 current_file = open(input_file)1516 print("First let's print the whole file:\n")1718 print_all(current_file)1920 print("Now let's rewind, kind of like a tape.")2122 rewind(current_file)2324 print("Let's print three lines:")2526 current_line = 127 print_a_line(current_line ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.