import csv


def key_value_data_pairs(data_file_path): 
    """
    Given an txt file of alternating rows of key and values, groups keys list and values list in a list. 
    
    Args: 
        data_file_path: raw string
            Absolute path of txt file of interest. 
    
    Returns:
        kv_pairs: list
            List containing sublist which contain keys and values, [[k1,v1],[k2,v2]...].
    
    """
    with open(data_file_path, mode='r') as file: 
        reader = csv.reader(file, delimiter=',')
        data = [row for row in reader] 
        
    kv_pairs = [data[i:i+2] for i in range(0,len(data),2)]
    return kv_pairs