将 ndarray 转换为 Pandas 数据框

Question

I am trying to just get the unique values of a pandas column into a new pandas dataframe as such:我试图将pandas列的唯一值放入新的pandas数据框中：

res = df.resolution.unique()
a = pd.DataFrame()
a['Unique Resolution Types'] = pd.DataFrame(res)

But I am getting this error:但我收到此错误：

ValueError: Cannot set a frame with no defined index and a value that cannot be converted to a Series

I tried converting res into a list but still the same error.我尝试将 res 转换为列表，但仍然出现相同的错误。 How do I resolve this?我该如何解决？

Answer 1

It is not correct to write pd.Dataframe(res);写pd.Dataframe(res)是不对的；

res = df.resolution.unique()
a = pd.DataFrame()
a['Unique Resolution Types'] = res

Now, it will work.现在，它将起作用。