one hot encoding - pandas

one_hot.py

import pandas as pd

# df now has two columns: name and country
df = pd.DataFrame({
        'name': ['josef','michael','john','bawool','klaus'],
        'country': ['russia', 'germany', 'australia','korea','germany']
    })

# use pd.concat to join the new columns with your original dataframe
df = pd.concat([df,pd.get_dummies(df['country'], prefix='country')],axis=1)

# now drop the original 'country' column (you don't need it anymore)
df.drop(['country'],axis=1, inplace=True)