def df_variables_info(df):
    """
    This function gives information about the df: number of observations, variables, type and number of variables
    
    params: df is a dataframe from which we want the information
    return: NONE
    """
    # Number of variables
    print('Number of variables:', df.shape[1])
    
    #  Number of observations
    print('Number of observations:', df.shape[0])
    
    # Summary of the type of variables in the dataframe
    print('Type of variables in the dataframe: \n', df.dtypes.value_counts(),'\n')
    
    return None