[英]How to convert a python dictionary with tuples into a pandas dataframe?
[英]Python + Pandas + Spark - How to import a dataframe into Pandas dataframe and convert it into a dictionary?
如何将数据框导入Pandas数据框并将其转换为字典?
我有从Spark创建的数据框,
sc = SparkContext(appName="PythonSQL")
sqlContext = SQLContext(sc)
path = os.path.join(os.environ['SPARK_HOME'], "examples/src/main/resources/people.json")
# Create the DataFrame
df = sqlContext.read.json(path)
# Register this DataFrame as a table.
df.registerTempTable("people")
# SQL statements can be run by using the sql methods provided by sqlContext
teenagers = sqlContext.sql("SELECT name FROM people")
sc.stop()
当我尝试将其导入熊猫时,
teenagers = pd.DataFrame(teenagers, columns=['name'])
我得到这个错误,
[客户端127.0.0.1:50885] PandasError:未正确调用DataFrame构造函数!
毕竟,我只想将数据框转换为字典,
dict = teenagers.set_index('name').to_dict()
print dict
有任何想法吗?
可以使用toPandas
方法将Spark DataFrame转换为pandas DataFrame。
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