用3.6.5版报错是为什么呢?AttributeError: 'NoneType' object has no attribute 'join'
d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 } def generate_tr(name, score): if score < 60: return '<tr><td>%s</td><td style="color:red">%s</td></tr>' % (name, score) return '<tr><td>%s</td><td>%s</td></tr>' % (name, score) tds = [generate_tr(name, score) for name, score in d.items()] print ('<table border="1">') print ('<tr><th>Name</th><th>Score</th><tr>') print ('\n').join(tds) print ('</table>')