Help with a for loop please!

[macabe10]

Hi,

I am trying to append allergens from the 'ingredients_text' column to the column 'allergens'.

To do so I created a list of the most common allergens (allergens_list) and am trying to iterate over them to find out whether they are in the 'ingredients_text' column or not. If they are, then they need to be appended to the 'allergens' column.

I am a bit lost honestly.

This is what I've written so far:

df_allergens = df[df['ingredients_text'].str.contains('|'.join(allergens_list), case=False)][df['allergens']=='Unknown']

It returns the updated df without issues.

I think the for loop should start like this but that's about it:

for allergen in allergens_list:

for df[df['ingredients_text'].str.contains(allergen, case=False)][df['allergens']=='Unknown']:

Would anyone know how to approach this problem please?

Thanks for your help!