[Python] How to change Pandas dataframe column name from 'NaN' to something else

I have tried to string the column names and then change them -- no success, it left it NaN:

data.rename(columns=str).rename(columns={'NaN':'Tip Analiza','NaN':'Limite' }, inplace=True)


I tried to use the in function to replace NaN-- no success, it gave an error:

data.columns = pd.Series([np.nan if 'Unnamed:' in x else x for x in data.columns.values]).ffill().values.flatten()

TypeError: argument of type 'float' is not iterable
​

What should I try?

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