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Python code
data.csv
 
​x
 
import pandas as pd
​
colors = pd.DataFrame({'color': ['blue', 'red', 'green']})
dummies = pd.get_dummies(colors, drop_first=True)
dummies['color'] = colors['color']
​
print(dummies)
​
   color_green  color_red  color
0            0          0   blue
1            0          1    red
2            1          0  green