how to delete rows with '?' in a dataset python code example

Example 1: delete row from dataframe python

df.drop(df.index[-2])
df.drop(df.index[[3, 4]])
df.drop(['row_1', 'row_2'])
df.drop('column_1', axis=1)
df[df.name != 'cell']

Example 2: dataframe delete row

df.drop(df.index[2])