如何在列表中的哈希中搜索特定值？Python

Question

我是一名业余的Python用户，请多多包涵。我创建了一个列表，并用哈希值填充了它。但是我遇到了一些麻烦，因为我需要在整个列表中搜索，找到第一个具有特定值的哈希值并更新它。有没有人知道该怎么做？

character = [{"No": 1, "Name":"Jeff", "Level": 29, "Health": 290},
             {"No": 2, "Name":"Bill", "Level": 31, "Health": 310},
             {"No": 3, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 4, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 5, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 6, "Name":"EMPTY", "Level": 0, "Health": 0}]

在这段代码中，我需要找到第一个名字为空的哈希值，并用另一个哈希值来更新它。

我尝试使用索引，但没有成功，提示“语法无效”。

x = character.index("EMPTY")
character[x].update(player)
print(character)

Answer 1

我建议只把活跃的玩家放进character列表里，而不是把空的玩家也放进去。这样的话，当新玩家创建时，你可以直接把他们加到这个列表里。

不过，这个方法应该能满足你的需求：

# create a new player. NOTE: "No" is updated when appending to character list
player = {"No": 1, "Name":"Player", "Level": 30, "Health": 300}

# find the character index
idx = 0
for c in character:
    if c['Name'] == 'EMPTY':
        break
    else:
        idx += 1

# update player number
player['No'] = idx + 1


# replace element in list
character[idx] = player

Answer 2

是的，列表不能直接使用索引方法。应该用线性搜索来找到'Name'等于'Empty'的项。

Answer 3

下面是更新第一次出现的内容的方法：

character = [{"No": 1, "Name":"Jeff", "Level": 29, "Health": 290},
             {"No": 2, "Name":"Bill", "Level": 31, "Health": 310},
             {"No": 3, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 4, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 5, "Name":"EMPTY", "Level": 0, "Health": 0},
             {"No": 6, "Name":"EMPTY", "Level": 0, "Health": 0}]


player = {"No": 7, "Name":"Alex", "Level": 25, "Health": 250}

for character_hash in character:
    if character_hash["Name"] == "EMPTY":
        character_hash.update(player)
        break  # Break out of the loop after updating the first empty character

print(character)