替换整个 DataFrame 中的字符串/值

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

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

Answer 2

考虑到data是您的pandas DataFrame data pandas DataFrame您还可以使用：

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

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.