A Concise Introduction to Programming in Python

Chapter 16

String Methods

Files are not limited to those on your hard drive. The following program

retrieves a web page from the Internet, and then uses Python’s string methods

to display specific information from it.

Listing 16.1: GCS Menu

1 # menu.py

2

3 import urllib.request

4

5 URL = "http://www.central.edu/go/gcsmenu"

6

7 def getpage(url):

8 with urllib.request.urlopen(url) as f:

9 return str(f.read())

10

11 def gettag(page, tag, start=0):

12 opentag = "<" + tag + ">"

13 closetag = "</" + tag + ">"

14 i = page.find(opentag, start)

15 if i == -1:

16 return None, i

17 j = page.find(closetag, i)

18 return page[i + len(opentag):j], j

19

20 def process(page):

21 heading, ...