9.4项目第4步中的练习，只做了1, 3题
9.4.1

import os, shutil

# Loop over the file in the working directory.
for filename in os.listdir():
    preFilename = 'duke_' + filename

    # Get the full, absolute file paths.
    absWorkingDir = os.path.abspath('.')
    filePath      = os.path.join(absWorkingDir + '\\' + filename)
    preFilePath   = os.path.join(absWorkingDir + '\\' + preFilename)

    # Rename the files.
    print("Rename '%s' to '%s'..." % (filePath, preFilePath))
    #shutil.move(filePath, preFilePath)  # uncomment after test

9.4.3
在写正则表达式时，我刚开始用的是re.compile(r'^(.*)(0+)(.*)$')，可是这样总是只把文件名中需要删除的‘0’中的一个删除，剩下的依然存在。鱼C工作室中的‘atlf11’做了解答，改为re.compile(r'^(.*?)(0+)(.*)$')。仅仅加了一个'?'就完美解决了这个问题。

import re, os, shutil

# Create a regex that matches files with '0' in the filename.
zeroPattern = re.compile(r'^(.*?)(0+)(.*)$')

# Loop over the files in the working directory.
for filename in os.listdir():
    mo = zeroPattern.search(filename)

    # Skip file without '0' in the filename.
    if mo == None:
        continue

    # Get the different parts of the filename.
    beforePart = mo.group(1)
    zeroPart   = mo.group(2)
    afterPart  = mo.group(3)

    # Form the filename without '0'.
    zeroFilename = beforePart + afterPart

    # Get the full, absolute file paths.
    absWorkingDir = os.path.abspath('.')
    filePath      = os.path.join(absWorkingDir + '\\' + filename)
    zeroFilePath  = os.path.join(absWorkingDir + '\\' + zeroFilename)

    # Rename the files.
    print("Renaming '%s' to '%s'" % (filePath, zeroFilePath))
    shutil.move(filePath, zeroFilePath) # uncomment after test