how to get_dummies one column in pandas code example

Example 1: getting dummies for a column in pandas dataframe

note:
dummies = pd.get_dummies(df[['column_1']], drop_first=True)

note:for more that one coloum keep ading in the list 
dummies = pd.get_dummies(df[['column_1', 'column_2','column_3']], drop_first=True)

Example 2: how to get dummies in a dataframe pandas

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