from pyspark.sql import SparkSession
# 初始化spark会话
spark = SparkSession   .builder   .getOrCreate()
spark_df = spark.createDataFrame(pandas_df)

import pandas as pd
pandas_df = spark_df.toPandas()

import pandas as pd
def _map_to_pandas(rdds):
  return [pd.DataFrame(list(rdds))]
  
def topas(df, n_partitions=None):
  if n_partitions is not None: df = df.repartition(n_partitions)
  df_pand = df.rdd.mapPartitions(_map_to_pandas).collect()
  df_pand = pd.concat(df_pand)
  df_pand.columns = df.columns
  return df_pand
  
pandas_df = topas(spark_df)