python 合并文件小程序

按网上的教程，自己写了一个小程序 有几处有点不一样，记录在这里，为自己留个底子

#coding=gbkimport sys, os, msvcrtdef join(in_filenames, out_filename):    out_file=open(out_filename, 'w+')        err_files=[]    for file in in_filenames:        try:            print file            in_file=open(file, 'r')                        out_file.write(in_file.read())            out_file.write('\n\n')            in_file.close()        except IOError:            print 'error joining', file            err_files.append(os.file)    out_file.close()    print 'joining completed. %d file(s) missed' % len(err_files)    print 'output file:', out_filename    if len(err_files)>0:        print 'missed files:'        print '----------------------------'        for file in err_files:            print file        print '----------------------------'        if __name__=='__main__':    print 'scanning...'    in_filenames=[]    file_count=0    for file in os.listdir(os.getcwd()+'\\alltxt'): #进入工作目录下的文件夹        if file.lower().endswith('all.txt'):                    os.remove(os.getcwd()+'\\alltxt\\'+file)  #不加getcwd()的话，不能删除文件        elif file.lower().endswith('.html'):            in_filenames.append(os.getcwd()+'\\alltxt\\'+file)            file_count+=1        if len(in_filenames)>0:        print '----------------------------'        print '\n'.join(in_filenames)        print '----------------------------'        print '%d partial(s) in toral.'% file_count        print 'joining...'        join(in_filenames, os.getcwd()+'\\alltxt\\all.txt')    else:        print 'nothing found.'    msvcrt.getch()