ValueError: Cannot run multiple SparkContexts at once; existing SparkContext ...
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将代码写成如下形式：
from pyspark import SparkContexttry: sc.stop() #停止以前的SparkContext，要不然下面创建工作会失败except: passsc=SparkContext('local','pyspark')'''your code'''sc.stop() #最好是再停止一下本次的 1 0
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