Apply function 'str' object has no attribute 'str'

cause I don’t really understand why it works in one format and doesn’t work in another.

Works:

df['team'] = df['team'].str.extract(r'(\w+)+')

Doesn’t work:

def clear_teams(gr):
    return gr.str.extract(r'(\w+)+')
        
df['team'] = df['team'].apply(clear_teams)

I recive an error:

AttributeError: 'str' object has no attribute 'str'

Why it doesn’t work, can someone explain it to me ? pleas 🙂
How it has str attribute one time and another doesn’t ….

>Solution :

If use Series.apply then in function gr is scalar, function loop by element of Series. So cannot use Series functions for it like str.extract, but solution for processing by scalars:

def clear_teams(gr):
    try:
        return re.search(r'(\w+)+', text).group(1)
    except:
        return np.nan   

df['team'] = df['team'].apply(clear_teams)

If use Series.pipe then gr is Series, co all working correct:

def clear_teams(gr):
    return gr.str.extract(r'(\w+)+')

df['team'] = df['team'].pipe(clear_teams)

Or:

df['team'] = clear_teams(df['team'])