【问题标题】:How to use sort_index() on a dataframe?如何在数据帧上使用 sort_index()?
【发布时间】:2016-03-28 18:00:49
【问题描述】:

我使用 spark SQLContext 将 JSON 文件加载到数据框中。 它存储来自不同用户的推文。它看起来像下面。我在 python 中使用 pandas 库来探索这个数据框中的数据。

import pandas as pd
tweets = pd.read_json('/filepath')
sqlcontext = SQLContext(sc)
tweet_sdf = sqlcontext.createDataFrame(tweets)

tweet_sdf.show(10)
+-------------+------------------+-------------+--------------------+-------------------+
|      country|                id|        place|                text|               user|
+-------------+------------------+-------------+--------------------+-------------------+
|        India|572692378957430784|       Orissa|@always_nidhi @Yo...|    Srkian_nishu :)|
|United States|572575240615796736|    Manhattan|@OnlyDancers Bell...| TagineDiningGlobal|
|United States|572575243883036672|    Claremont|1/ "Without the a...|        Daniel Beer|
|United States|572575252020109312|       Vienna|idk why people ha...|   someone actually|
|United States|572575274539356160|       Boston|Taste of Iceland!...|     BostonAttitude|
|United States|572647819401670656|      Suwanee|Know what you don...|Collin A. Zimmerman|
|    Indonesia|572647831053312000|  Mario Riawa|Serasi ade haha @...|   Rinie Syamsuddin|
|    Indonesia|572647839521767424|Bogor Selatan|Akhirnya bisa jug...|       Vinny Sylvia|
|United States|572647841220337664|      Norwalk|@BeezyDH_ it's li...|                Cas|
|United States|572647842277396480|       Santee| obsessed with music|               kimo|
+-------------+------------------+-------------+--------------------+-------------------+
only showing top 10 rows

tweet_sdf.printSchema()

root
 |-- country: string (nullable = true)
 |-- id: long (nullable = true)
 |-- place: string (nullable = true)
 |-- text: string (nullable = true)
 |-- user: string (nullable = true)

我正在尝试使用下面的索引“id”对数据框进行排序。

tweet_sdf.sort_index(by='id', ascending=False, inplace=True)

但是我收到了下面提到的属性错误。 AttributeError: 'DataFrame' 对象没有属性 'sort_index'

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-106-6cd99444a12a> in <module>()
----> 1 tweet_sdf.sort_index(by='id', ascending=False, inplace=True)

/home/notebook/spark-1.6.0-bin-hadoop2.6/python/pyspark/sql/dataframe.pyc in __getattr__(self, name)
    837         if name not in self.columns:
    838             raise AttributeError(
--> 839                 "'%s' object has no attribute '%s'" % (self.__class__.__name__, name))
    840         jc = self._jdf.apply(name)
    841         return Column(jc)

AttributeError: 'DataFrame' object has no attribute 'sort_index'

pandas 上的版本是 0.18.0,python 版本是 2.7.11 有人可以帮我理解为什么会这样吗?

【问题讨论】:

  • tweet_sdf的类型是什么?
  • 它的类型是“pyspark.sql.dataframe.DataFrame”
  • 然后尝试只使用sort 而不是sort_index
  • 谢谢。那行得通。这是否意味着可以在数据帧上使用的所有方法都不能在使用 sqlcontext 创建的数据帧上使用?任何参考都会有很大帮助...

标签: python pandas dataframe spark-dataframe


【解决方案1】:

Changes to sorting API

DataFrame.sort_index API reference

我相信“by”参数在 0.17.0 之后已被删除。您可能需要更改参数或使用排序。

DataFrame.sort_index() 的 by 参数已被弃用,将在未来版本中删除。

【讨论】:

    【解决方案2】:

    我认为您可以使用sort_values,因为您需要按列排序id

    print tweet_sdf
             country                  id          place                 text  \
    0          India  572692378957430784         Orissa     @always_nidhi@Yo   
    1  United States  572575240615796736      Manhattan    @OnlyDancers Bell   
    2  United States  572575243883036672      Claremont    1/ "Without the a   
    3  United States  572575252020109312         Vienna    idk why people ha   
    4  United States  572575274539356160         Boston    Taste of Iceland!   
    5  United States  572647819401670656        Suwanee    Know what you don   
    6      Indonesia  572647831053312000    Mario Riawa    Serasi ade haha @   
    7      Indonesia  572647839521767424  Bogor Selatan    Akhirnya bisa jug   
    8  United States  572647841220337664        Norwalk    @BeezyDH_ it's li   
    9  United States  572647842277396480         Santee  obsessed with music   
    
                     user  
    0     Srkian_nishu :)  
    1  TagineDiningGlobal  
    2         Daniel Beer  
    3    someone actually  
    4      BostonAttitude  
    5  Collin A Zimmerman  
    6    Rinie Syamsuddin  
    7        Vinny Sylvia  
    8                 Cas  
    9                kimo 
    
    tweet_sdf.sort_values(by='id', ascending=False, inplace=True)
    print tweet_sdf
             country                  id          place                 text  \
    0          India  572692378957430784         Orissa     @always_nidhi@Yo   
    9  United States  572647842277396480         Santee  obsessed with music   
    8  United States  572647841220337664        Norwalk    @BeezyDH_ it's li   
    7      Indonesia  572647839521767424  Bogor Selatan    Akhirnya bisa jug   
    6      Indonesia  572647831053312000    Mario Riawa    Serasi ade haha @   
    5  United States  572647819401670656        Suwanee    Know what you don   
    4  United States  572575274539356160         Boston    Taste of Iceland!   
    3  United States  572575252020109312         Vienna    idk why people ha   
    2  United States  572575243883036672      Claremont    1/ "Without the a   
    1  United States  572575240615796736      Manhattan    @OnlyDancers Bell   
    
                     user  
    0     Srkian_nishu :)  
    9                kimo  
    8                 Cas  
    7        Vinny Sylvia  
    6    Rinie Syamsuddin  
    5  Collin A Zimmerman  
    4      BostonAttitude  
    3    someone actually  
    2         Daniel Beer  
    1  TagineDiningGlobal  
    

    【讨论】:

    • 如果我或 MikeS 的回答有帮助,请不要忘记accept。谢谢。
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