Remove os.environ step from spark READMEs

(c) Copyright IBM Corp. 2016

all-spark-notebook/README.md

@@ -32,7 +32,7 @@ This configuration is nice for using Spark on small, local data.
 1. Open a Python 2 or 3 notebook.
 2. Create a `SparkContext` configured for local mode.
 
-For example, the first few cells in a Python 3 notebook might read:
+For example, the first few cells in a notebook might read:
 
 ```python
 import pyspark
@@ -43,15 +43,6 @@ rdd = sc.parallelize(range(1000))
 rdd.takeSample(False, 5)
 ```
 
-In a Python 2 notebook, prefix the above with the following code to ensure the local workers use Python 2 as well.
-
-```python
-import os
-os.environ['PYSPARK_PYTHON'] = 'python2'
-
-# include pyspark cells from above here ...
-```
-
 ### In a R Notebook
 
 0. Run the container as shown above.

pyspark-notebook/README.md

@@ -27,7 +27,7 @@ This configuration is nice for using Spark on small, local data.
 2. Open a Python 2 or 3 notebook.
 3. Create a `SparkContext` configured for local mode.
 
-For example, the first few cells in a Python 3 notebook might read:
+For example, the first few cells in the notebook might read:
 
 ```python
 import pyspark
@@ -38,15 +38,6 @@ rdd = sc.parallelize(range(1000))
 rdd.takeSample(False, 5)
 ```
 
-In a Python 2 notebook, prefix the above with the following code to ensure the local workers use Python 2 as well.
-
-```python
-import os
-os.environ['PYSPARK_PYTHON'] = 'python2'
-
-# include pyspark cells from above here ...
-```
-
 ## Connecting to a Spark Cluster on Mesos
 
 This configuration allows your compute cluster to scale with your data.