def info(self, show = True):
  
  '''
  Print concise summary of a pyspark.sql.DataFrame
  This method prints information about a DataFrame
  including the index dtype and columns, non-null values
  
  Args:
    show(bool): default True. show result
    
    
  Returns:
    pyspark.sql.DataFrame
  
  '''
  
  subset = self.schema.names
  total_rows = self.count()
  _non_null = \
    self.select([(total_rows - f.sum(f.when(f.col(col).isNull(),1).otherwise(0))).alias(col) for col in subset])\
    .toPandas()\
    .transpose()\
    .reset_index()\
    .rename(columns={'index':'Column', 0:'Non-Null Count'})
  _non_null = spark.createDataFrame(_non_null)
  _dtype = spark.createDataFrame(self.dtypes).withColumnRenamed('_1','Column').withColumnRenamed('_2','Dtype')
  result = _dtype.join(_non_null, on = 'Column').select('Column', 'Non-Null Count', 'Dtype')
  
  if show:
    return result.show()
  else:
    return result

pyspark.sql.DataFrame.info = info