search_relevance_1.py

def search_df_texts(df, query_string: str):
    """
    - Parameters: df (Pandas DataFrame), query_string (string). df must 
      contain a "text" column.
    - Returns: A subset of df containing only rows where each term in 
      query_string appeared as a substring in df["text"].
    """
    terms = query_string.lower().split(" ")
    filters = [df["text"].str.lower().str.contains(term) for term in terms]
    return df[np.all(filters, axis=0)]