David Beazley is one of the best trainers on Python topics. This script downloads several code bases from David's website (http://www.dabeaz.com) to a local directory.

beazleyCodeDownload.py

# beazleyCodeDownload.py
#
# copy source code from http://www.dabeaz.com
#  into local directory David_Beazley

import bs4, os, requests

codeBases = ('coroutines', 'generators', 'pydata',
             'python3io', 'usenix2009/concurrent')
baseURLFmt = 'http://www.dabeaz.com/{}/'
destDirFmt = 'David_Beazley/{}/'

aboutFileText = """#!/usr/bin/env python
theURL = '{}'
import webbrowser; webbrowser.open(theURL)"""

def getEmbeddedPyURLs(inSoup):
    for theURL in inSoup.find_all('a'):
        if theURL['href'].endswith('.py'):
            yield baseURL + theURL['href']

def copyWebPageToFile(inSrceURL, inDestFileName):
    with open(inDestFileName, 'w') as destFile:
        destFile.write(requests.get(inSrceURL).text)

def writeAboutFile(inSrceURL, inDestFileName):
    with open(inDestFileName, 'w') as destFile:
        destFile.write(aboutFileText.format(inSrceURL))

for codeBase in codeBases:
    baseURL  = baseURLFmt.format(codeBase)
    codeBase = codeBase.lstrip('usenix2009/')
    destDir  = destDirFmt.format(codeBase)
    try:             os.makedirs(destDir)
    except OSError:  pass
    theSoup = bs4.BeautifulSoup(requests.get(baseURL).text)
    fileCount = 0
    fmt = 'Copying {}\n             to {}...'
    print(fmt.format(baseURL, destDir))
    for embededURL in getEmbeddedPyURLs(theSoup):
        fileName = destDir + embededURL.rpartition('/')[2]
        #print(fmt.format(embededURL, fileName))
        copyWebPageToFile(embededURL, fileName)
        fileCount += 1
    fmt = '{} files copied into {}\n'
    print(fmt.format(fileCount, destDir))
    aboutFileName = 'about{}.py'.format(codeBase.title())
    writeAboutFile(baseURL.rstrip('/'), destDir+aboutFileName)
print('Done. ' + '=' * 25)