fixed python unit test

python/pyspark/sql/functions.py

@@ -308,8 +308,10 @@ def e():
     Returns the float value that is closer than any other to e, the base of the natural
     logarithms.
 
-    >>> sqlContext.createDataFrame([(1,)], ['a']).select((e()).alias('e')).collect()
-    [Row(e=2.7182818284590451)]
+    >>> e = sqlContext.createDataFrame([(1,)], ['a']).select((e()).alias('e')).collect()
+
+    >>> round(e[0][0], 10)
+    2.7182818285
     """
     sc = SparkContext._active_spark_context
     jc = sc._jvm.functions.e()
@@ -377,8 +379,10 @@ def pi():
     Returns the float value that is closer than any other to pi, the ratio of the circumference
     of a circle to its diameter.
 
-    >>> sqlContext.createDataFrame([(1,)], ['a']).select((pi()).alias('pi')).collect()
-    [Row(pi=3.1415926535897931)]
+    >>> pi = sqlContext.createDataFrame([(1,)], ['a']).select((pi()).alias('pi')).collect()
+
+    >>> round(pi[0][0], 10)
+    3.1415926536
     """
     sc = SparkContext._active_spark_context
     jc = sc._jvm.functions.pi()