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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _j9SaveCurrent(sDir = '.'):
 """Downloads and saves all the webpages For Backend """

    dname = os.path.normpath(sDir + '/' +  datetime.datetime.now().strftime("%Y-%m-%d_J9_AbbreviationDocs"))
    if not os.path.isdir(dname):
        os.mkdir(dname)
        os.chdir(dname)
    else:
        os.chdir(dname)
    for urlID, urlString in j9urlGenerator(nameDict = True).items():
        fname = "{}_abrvjt.html".format(urlID)
        f = open(fname, 'wb')
        f.write(urllib.request.urlopen(urlString).read())