[Python] Is there a way to select the entire arbitrary string value in a pandas data frame and...

I have a data frame with a variety of string values. For a given column, if there is any string entered, I would like to replace it with the same value (say 'present').

Example:

data = {'item_name': ['apple', 'banana', 'cherry', 'pineapple', 'apple pie', 'banana split', 'hafts to chos', 'lov_frutz', 'I always pick apples', None, None, None]}
df = pd.DataFrame(data)


Result I want:

item_name
'fruit'
'fruit'
'fruit'
'fruit'
'fruit'
'fruit'
'fruit'
'fruit'
'fruit'
nan
nan
nan

response = 'fruit'


I have tried using regex but don't seem to understand it correctly, so tried:

df[col] = df[col].replace(to_replace=r'\w\b', value = response, regex = True)

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