'for loop only saving last value of last variable

i am using one hot encoding for mercedes-benz dataset kaggle for three columns in a for loop but when use pd.get_dummies in a for loop the one hot encoding applies for "X6" column only. i assume it is iterating through other two "X3" and "X4" as well but it is not making change into dataframe. X3 has 3 columns X4 has 4 columns and X6 has 12 columns.

 for column in ['X3', 'X4','X6']:
    dummies = pd.get_dummies(df[column])
    df[dummies.columns] = dummies
python-3.xfor-loopone-hot-encoding


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