要说Python绝对是最好用的工具语言，曾写过用来批量修改文件后缀名的脚本，今天想为早期的静态站点存档的html文件建立sitemap文件，于是便有了这样的需求：

将指定目录下的所有文件（包含子目录）列表出来，当然要筛选出需要的后缀名.htm、.html的文件并保存到txt文件中，下面为全部实现代码：

import os
'''
    For the given path, get the List of all files in the directory tree 
'''
def getListOfFiles(dirName):
    # create a list of file and sub directories 
    # names in the given directory 
    listOfFile = os.listdir(dirName)
    allFiles = list()
    # Iterate over all the entries
    for entry in listOfFile:
        # Create full path
        fullPath = os.path.join(dirName, entry)
        # If entry is a directory then get the list of files in this directory 
        if os.path.isdir(fullPath):
            allFiles = allFiles + getListOfFiles(fullPath)
        else:
            allFiles.append(fullPath)
                
    return allFiles        
def main():
    
    dirName = 'Path/to/Directory';
    
    # Option1 :: Get the list of all files in directory tree at given path
    listOfFiles = getListOfFiles(dirName)
    
    # Print the files
    for elem in listOfFiles:
        #print(elem)
        filename, file_extension = os.path.splitext(elem)
        #Extensions filter
        extensions = ['.htm', '.html']
        #print(file_extension)
        if file_extension in extensions:
            with open('files.txt', 'a') as f:
                f.write(elem)
                f.write('\n')
    print ("*********Done*******")
    
    '''
    # Option 2 :: Get the list of all files in directory tree at given path
    listOfFiles = list()
    for (dirpath, dirnames, filenames) in os.walk(dirName):
        listOfFiles += [os.path.join(dirpath, file) for file in filenames]
        
        
    # Print the files    
    for elem in listOfFiles:
        filename, file_extension = os.path.splitext(elem)
        extensions = ['.htm', '.html']
        #print(file_extension)
        if file_extension in extensions:
            print(elem)    
    '''
        
        
if __name__ == '__main__':
    main()