老師，您好，我在編寫某段程序時出現(xiàn)一些問題難以搞懂，忘能指點

#!usr/bin/python
#?-*-?coding:?UTF-8?-*-
#?lexicon.py
#?掃描器模塊，用以判斷用戶輸入的詞匯類型
#用戶輸入
user_input?=?raw_input("input?now!!\n>")
words?=?user_input.split()?#分割字符串并以列表形式返回
def?scan(words):
????#詞匯表
????direction_list?=?['north',??'south',?'east',
????????????????????'west',?'down',?'up',?'left',
????????????????????????'right',?'back']
????verb_list?=?['go',?'stop',?'kill',?'eat']
????stops_list?=?['the',?'in',?'of',?'from',
?????????????????????'at',?'it']
????nouns_list?=?['door',?'bear',?'princess',
????????????????????'cabinet']
????#用于存儲掃描處理結(jié)果
????results?=?[]
????#遍歷列表每個元素
????for?word?in?words:
????#判斷是否為方向
????????if?word?in?direcition_list:
????????????stuff?=?('direction',?word)
????????????return?results.append(stuff)
????#判斷是否為動詞
　　　　if?word?in?verb_list:
????????????stuff?=?('verb',?word)
????????????return?results.append(stuff)
????#判斷是否為修飾詞
????????if?word?in?stops_list:
????????????stuff?=?('stops',?word)
????????????return?results.append(stuff)
????#判斷是否為名詞
????????if?word?in?nouns_list:
????????????stuff?=?('nouns',?word)
????????????return?results.append(stuff)
????#判斷是否為數(shù)字
????????if?convert_number(word):
????????????return?results.append(convert_number(word))
????????????
def?convert_number(s):
????try:
????????return?int(s)
????except?ValueError:
????????return?None

File?"lexicon.py",?line?32
????　　????if?word?in?verb_list:
????^
SyntaxError:?invalid?syntax
??1?#!/usr/bin/python???????????????????????????????????????????????????????????
??2?#?-*-?coding:?UTF-8?-*-
??3?#?test.py
??4?lists?=?[1,2,3,4,5,6,7,8]
??5?list1?=?[1,2]
??6?list2?=?[3,4,5]
??7?list3?=?[6,7,8]
??8?for?i?in?lists:
??9?????if?i?in?list1:
?10?????????print?"1"
?11?????if?i?in?list2:
?12?????????print?"2"
?13?????if?i?in?list3:
?14?????????print?"3"
?15??
#?python?test.py?
1
1
2
2
2
3
3

3

如上，因為第一段代碼執(zhí)行報錯，所以我寫了下面一段用來測試，發(fā)現(xiàn)for循環(huán)中嵌套使用多個if語句語法正確

我不知道是什么原因了