用python在字典中的列表中追加值

我正在尝试向字典中的列表添加值。我已经查看并尝试了

追加

，但是我得到了一个错误

代码：

错误：

AttributeError:“str”对象没有属性“append”

期望输出：

{'Shelba': ['Shelba Barthel', 'Shelba Crowley', 'Shelba Fernald', 'Shelba Odle', 'Shelba Fry'],'David': ['David Joyner', 'David Zuber'], 'Brenton': ['Brenton Joyner', 'Brenton Zuber'], 'Maren': ['Maren Fry'], 'Nicol': ['Nicol Barthel']}

---

创建列表时，将立即用字符串替换它。 尝试：

而不是

if fn in firsts:
    firsts[fn].append(full)
else:
    firsts[fn] = []
    firsts[fn] = full

---

firsts[fn]=full

？Try

firsts[fn]=full

因为

firsts

是一本字典。@ArkistarvhKltzuonstev“Try”是什么意思？这一行就是问题所在。对于

defaultdict

def name_counts(x):
firsts = {}
for full in x:
    part = full.split()
    fn = part[0]
    if fn not in firsts:
        firsts[fn] = []

    firsts[fn].append(full)
return(firsts)


name_list = ["David Joyner", "David Zuber", "Brenton Joyner",
         "Brenton Zuber", "Nicol Barthel", "Shelba Barthel",
         "Shelba Crowley", "Shelba Fernald", "Shelba Odle",
         "Shelba Fry", "Maren Fry"]
print(name_counts(name_list))

if fn in firsts:
    firsts[fn].append(full)
else:
    firsts[fn] = [full]

if fn in firsts:
    firsts[fn].append(full)
else:
    firsts[fn] = []
    firsts[fn] = full