去重时 出现错误

wp231957

在尝试使用>>> dfb = dfb.drop_duplicates(subset='ym', keep='first') 去重时 出现错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'dict' object has no attribute 'drop_duplicates'

具体过程如下：
>>> dfa=pd.read_excel("monthtiqu2.xlsx")
>>> dfb={}
>>> dfb["ym"] = dfa['日期'].dt.to_period('M')
>>> dfb = dfb.drop_duplicates(subset='ym', keep='first')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'dict' object has no attribute 'drop_duplicates'
>>>

wp231957

知道了 dfb 是字典 不是df