python - Pandas: Get Dummies

Question

I have the following dataframe:

   amount  catcode    cid      cycle      date     di  feccandid    type
0   1000    E1600   N00029285   2014    2014-05-15  D   H8TX22107   24K
1   5000    G4600   N00026722   2014    2013-10-22  D   H4TX28046   24K
2      4    C2100   N00030676   2014    2014-03-26  D   H0MO07113   24Z

I want to make dummy variables for the values in column type. There about 15. I have tried this:

pd.get_dummies(df['type'])

And it returns this:

           24A  24C  24E  24F  24K  24N  24P  24R  24Z
date                                    
2014-05-15  0    0    0    0    1    0    0    0    0
2013-10-22  0    0    0    0    1    0    0    0    0
2014-03-26  0    0    0    0    0    0    0    0    1

What I would like is to have a dummy variable column for each unique value in Type

Answer 1

You can try :

df = pd.get_dummies(df, columns=['type'])

Answer 2

Consider I have the following dataframe:

   Survived  Pclass     Sex   Age     Fare
0         0       3    male  22.0   7.2500
1         1       1  female  38.0  71.2833
2         1       3  female  26.0   7.9250
3         1       1  female  35.0  53.1000
4         0       3    male  35.0   8.0500

There are two ways to implement get_dummies:

Method 1:

one_hot = pd.get_dummies(dataset, columns = ['Sex'])

This will return:

   Survived  Pclass  Age     Fare  Sex_female  Sex_male
0         0       3   22   7.2500           0         1
1         1       1   38  71.2833           1         0
2         1       3   26   7.9250           1         0
3         1       1   35  53.1000           1         0
4         0       3   35   8.0500           0         1

Method 2:

one_hot = pd.get_dummies(dataset['Sex'])

This will return:

   female  male
0       0     1
1       1     0
2       1     0
3       1     0
4       0     1

Answer 3

Please try :

type_dummies = pd.get_dummies(df['type'],drop_first=True)

df = pd.concat([df,type_dummies],axis=1)