Python 函数返回更新的字典

我在学字典 这是我的代码

def IncrementalCount(dict,a,b):

     dict={}.fromkeys(b,0)#creat dict initializing the count to each of "b" to 0 

     for txt in a:
          if txt in dict:
             dict[txt]+=1

     return (dict)        
counts={}
counts=IncrementalCount(counts,"{hello!{}","}{#")
print(counts)
counts=IncrementalCount(counts,"#Goodbye!}","}{#!@")
print(counts)

它打印输出

{'}': 1, '{': 2, '#': 0}
{'}': 1, '{': 0, '#': 1, '!': 1, '@': 0}

但它必须打印出来

{'}': 1, '{': 2, '#': 0}
{'}': 2, '{': 2, '#': 1, '!': 1, '@': 0}

---

请帮助我将计数重置为0是代码的问题。所以不要执行dict={}.fromkeysb，0，而只是初始化新键。大概是这样的：

def IncrementalCount(my_dict,a,b):
     dict.update({k:0 for k in b if k not in my_dict})
     for txt in a:
          if txt in my_dict:
             my_dict[txt]+=1
     return my_dict

counts={}
counts=IncrementalCount(counts,"{hello!{}","}{#")
print(counts)  # {'}': 1, '{': 2, '#': 0}
counts=IncrementalCount(counts,"#Goodbye!}","}{#!@")
print(counts)  # {'}': 2, '{': 2, '#': 1, '!': 1, '@': 0}

---

但是您正在将密钥重置为0。为什么不呢？它有什么问题？@siva请将答案标记为正确，因为它解决了您的问题