问在Python 3中逐行替换正则表达式

EN

pagenumber=1
directory_in_str='/home/somewhere/somedir/'
pathlist = Path(directory_in_str).glob('**/*.svg')
for path in pathlist:
#because path is object not string
  path_in_str = str(path)   
  print(path_in_str)

  with open(path_in_str, 'r+') as f:
    for line in f:
        myregex = r"(?:xlink:href\=\")(.*)(?:\?q=80\"\/\>)"
        result = myregex.search(line)

        if result:
            #If a match is found, replace the text in the line          
            origfullimgfilename = result
            formattedpagenumber = '{:0>3}'.format(pagenumber)
            replfullimgfilename='page-'+str(formattedpagenumber)+'-img1.jpg'
            line = re.sub(origfullimgfilename, replfullimgfilename, line.rstrip())  
            #Then retrieve the file! (origfullimgfilename)
            try:
                urllib.request.urlretrieve(origfullimgfilename+"?q=100", replfullimgfilename)
            except urllib.error.HTTPError as e:
                print("HTTP Error: "+str(e.code)+" - SVG URL: "+str(origfullimgfilename)+" - aborting\n")
                break
pagenumber += 1