First, convert date to datetime format to use conditional operand. It will return YYYY-MM-DD by default. ... <看更多>

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Dropping null values¶. In addition to the masking used before, there are the convenience methods, dropna() (which removes NA values) and fillna() ... ... <看更多>

I don't think that fillna is the issue here. The vaue in C should be pd.NA not np.nan. I am not sure if fillna is supposed to work for ... ... <看更多>

You can use the DataFrame.fillna function to fill the NaN values in your data. For example, assuming your data is in a DataFrame called df , ... <看更多>