Replace string/value in entire DataFrame

Question

I have a very large dataset were I want to replace strings with numbers. I would like to operate on the dataset without typing a mapping function for each key (column) in the dataset. (similar to the fillna method, but replace specific string with assosiated value).
Is there anyway to do this?

Here is an example of my dataset

data
   resp          A          B          C
0     1       poor       poor       good
1     2       good       poor       good
2     3  very good  very good  very good
3     4       bad        poor       bad 
4     5   very bad   very bad   very bad
5     6       poor       good   very bad
6     7       good       good       good
7     8  very good  very good  very good
8     9       bad        bad    very bad
9    10   very bad   very bad   very bad

The desired result:

 data
   resp  A  B  C
0      1  3  3  4
1     2  4  3  4
2     3  5  5  5
3     4  2  3  2
4     5  1  1  1
5     6  3  4  1
6     7  4  4  4
7     8  5  5  5
8     9  2  2  1
9    10  1  1  1

very bad=1, bad=2, poor=3, good=4, very good=5

//Jonas

Asked By: jonas

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Source

Answer 1

Use replace

In [126]: df.replace(['very bad', 'bad', 'poor', 'good', 'very good'], 
                     [1, 2, 3, 4, 5]) 
Out[126]: 
      resp  A  B  C
   0     1  3  3  4
   1     2  4  3  4
   2     3  5  5  5
   3     4  2  3  2
   4     5  1  1  1
   5     6  3  4  1
   6     7  4  4  4
   7     8  5  5  5
   8     9  2  2  1
   9    10  1  1  1

Answered By: waitingkuo

Answer 2

Considering data is your pandas DataFrame you can also use:

data.replace({'very bad': 1, 'bad': 2, 'poor': 3, 'good': 4, 'very good': 5}, inplace=True)

Answered By: Jash Shah

Answer 3

data = data.replace(['very bad', 'bad', 'poor', 'good', 'very good'], [1, 2, 3, 4, 5])

You must state where the result should be saved. If you say only data.replace(…) it is only shown as a change in preview, not in the envirable itself.

Answered By: Nikola S

Replace string/value in entire DataFrame

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