熊猫lambda TypeError对象浮动没有len（）

Question

用于更新的Python Pandas lambda列 lambda x: np.nan if x == '0/0' else df['RatioFraction']

过滤一列，然后使用lambda更改np.nan的条件，不投票（0/0）。

已收到

TypeError: object of type 'float' has no len()

代码：

df['RatioFraction'] = df_ff_reviews['VoteRatio'].apply(lambda x: np.nan if x == '0/0' else df['RatioFraction'])

Answer 1

尝试一下：

df['RatioFraction'] = df_ff_reviews['VoteRatio']

df['RatioFraction'].loc[df['RatioFraction'] == '0/0'] = np.nan

Answer 2

您可以尝试np.where：

df['RatioFraction'] = np.where(df['VoteRatio'] == '0/0', np.nan, df['VoteRation'])