Iterating through a list and storing results

I have a very simple script that looks as such:

from instagramy import InstagramUser

user = InstagramUser("shanutxo")

If you run this, it should return a response that looks as follows:

⚡️S H A N U T A N A U T⚡️ (shanutxo) -> life, style,
empowerment + entrepreneurship via real estate + more.➕

But the way I need it to work, the script is iterating through multiple usernames that would plug into InstagramUser(""). It would then capture the output, store in a dataframe, and move on to the next name in the list. I have attempted to try something like:

import pandas as pd
from instagramy import InstagramUser

users = [['hannahkshepherd'],['sydneyhopeee'],['shanutxo'],['sunshinejilll']]
users_df = pd.DataFrame(users, columns=['usernames'])

ser = users_df.apply(InstagramUsers, axis=1, raw=True)
pd.concat([users_df, pd.DataFrame(ser, columns="bio")], axis=1)

But it gives me the error: NameError: name 'InstagramUsers' is not defined

From Alexander’s answer, I try:

import pandas as pd
from instagramy import InstagramUser

users = ['calvinharris','beyonce','adele']

users_df = pd.DataFrame(users, columns=['username'])

print(users_df)

ser = users_df['username'].apply(InstagramUser)
print(ser)

test = pd.concat([users_df, pd.DataFrame(ser,columns=["bio"])], axis=1)

This returns a response that looks like:

But it’s not capturing the response text (For example, the response for beyonce should be stored as something like "CUFF IT ㅤ season")