pandas replace substring code example

Example 1: str replace pandas

>>> pd.Series(['foo', 'fuz', np.nan]).str.replace('f.', 'ba', regex=True)
0    bao
1    baz
2    NaN
dtype: object

Example 2: replace string if it contains a substring pandas

df_a.loc[df_a.categories.str.contains('beverage'), 'categories'] = 'beverage'


    categories      product_name
0   beverage        coca-cola
1   salty snacks    salted pistachios
2   beverage        fruit juice
3   beverage        lemon tea
4   salty crackers  roasted peanuts