How to replace all "False" values in any columns by values from other columns with the same names if that values are not False

Question

for example:

import pandas as pd


dc1 = {
    'n':[1, 2, 3, 4],
    'a':[0, 2, 0.0, 4],
    'b':[0,'', False, 5],
    }

dc2 = {
    'n':[1, 2, 3, 4],
    'a':[1, 0, 3, 0.0],
    'b':[6, 5, 8, 9],
    }

Merge on ‘n’ column. Is it possible values in ‘a'(and ‘b’) column in df1 is replaced by values of ‘a’ (and ‘b’) column in df2 if value of ‘a'(and ‘b’) in df1 is False (or some values that we can manually set [False, 0, 0.0, ‘Nan’, None, ”,’Null’]), and then drop column with suffix _drop?

In result (dict for example) must be that:

dc_result = {
    'n':[1, 2, 3, 4],
    'a':[1, 2, 3, 4],
    'b':[6, 5, 8, 5],
    }

Asked By: Константин Прудников

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Source

Answer 1

You can use isin to get the indexes where a cell in a or b contains an element from a manual list: [False, 0, 0.0, 'Nan', None, '','Null'] and use np.where to replace those elements:

replace_list = [False, 0, 0.0, 'Nan', None, '','Null']
df1[['a', 'b']] = ( np.where(df1[['a', 'b']].isin(replace_list), df2[['a', 'b']], 
                                                   df1[['a', 'b']]).astype(int) )

Answered By: Nuri Taş

How to replace all "False" values in any columns by values from other columns with the same names if that values are not False

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