pandas use map lambda to fillna python code example
Example: pandas use map lambda to fillna python
import numpy as np
df1['user_score'] = np.where(df1['user_score'].isna(), df2['user_score'], df1['user_score'])
import numpy as np
df1['user_score'] = np.where(df1['user_score'].isna(), df2['user_score'], df1['user_score'])