when to drop columns from dataset in python code example

Example 1: drop a column pandas

df.drop(['column_1', 'Column_2'], axis = 1, inplace = True)

Example 2: drop a column from dataframe

#to drop by column number instead of by column label, try this to delete, e.g. the 1st, 2nd and 4th columns
df = df.drop(df.columns[[0, 1, 3]], axis=1)  # df.columns is zero-based pd.Index