Python错误：无类型对象不可订阅

Question

我已经减少代码以仅显示我认为与以下错误相关的部分。这是在python 3.x中完成的，因为我正在教自己，所以我没有任何使用Python 2.x的经验。

谢谢！

Traceback (most recent call last): 
File "rpcombat_refactored.py", line 306, in <module> shopping = buy_equipment() 
File "rpcombat_refactored.py", line 242, in buy_equipment 
print("You have a", join_with_and(profile['inventory']), "in your bag.") 
File "rpcombat_refactored.py", line 94, in join_with_and elif sequence < 1: 
TypeError: unorderable types: list() < int() 

代码：

def join_with_and(sequence): 
    if len(sequence) > 1: 
     last_item = sequence[-1] 
     sentence = ", ".join(sequence[:-1]) 
     sentence = sentence + " and " + last_item 
    elif sequence < 1: 
     sentence = "whole lot of nothing" 
    else: 
     sentence = sequence[0] 
    return sentence 

def buy_equipment(): 

    # Omitting item list 
    # Omitting purchase prompt 

    # If the item is in stock and the player has enough gold, buy it 
    if purchase in stock: 
     if stock[purchase][0] <= profile['gold']: 
      test_phrase = profile['Name'] + " buys themself some equipment" 
      print(fix_gender(profile['Gender'],test_phrase)) 
      print("You buy a", purchase, "for", stock[purchase][0], "gold pieces.") 
      profile['gold'] -= stock[purchase][0] 
      profile['inventory'].append(purchase) 
      print("You have a", join_with_and(profile['inventory']), "in your bag.") 
      print("You have", profile['gold'], "left.") 
     else: 
      print("You don't have enough gold to buy that.") 
    elif purchase == 'done' or purchase == "": 
     return profile['inventory'] == [] and profile['gold'] > 10 
    else: 
     print("We don't have", purchase, "in stock.") 
    return purchase 

Answer 1

你generate_rpc方法不返回的个人资料。它什么都不返回。所以profile是None。