stripping chars in pandas

foo.py

import pandas as pd

if __name__ == '__main__':
    d = {'col1': [1, 2, 3],
         'col2': ['{abc defg', '{xyz pqr}', '{nan, foo}']}
    df = pd.DataFrame(d)
    print(df)

    df['col3'] = df['col2'].str.strip("{|}").astype('str')

    print(df)