PYTHON : Why can't PySpark find py4j.java_gateway?

PYTHON : Why can't PySpark find py4j.java_gateway?

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PYTHON : PySpark in iPython notebook raises Py4JJavaError when using count() and first()
PYTHON : PySpark in iPython notebook raises Py4JJavaError when using count() and first()
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PYTHON : PySpark in iPython notebook raises Py4JJavaError when using count() and first()

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