pyspark will pick one version of python from the multiple versions of python installed in the machine. In my case, I have python 3, 2.7 and 2.6 installed in my machine and pyspark was picking python 3 by default. If we have to change the python version used by pyspark, set the following environment variable and run pyspark.
similarly we can configure any version of python with pyspark. Ensure that python2.6 or whatever you are specifying is available