#  File:       space_age.py
#  Purpose:    Write a program that, given an age in seconds, calculates
#              how old someone is in terms of a given planet's solar years.
#  Programmer: Amal Shehu
#  Course:     Exercism
#  Date:       Saturday 17 September 2016, 06:09 PM


class SpaceAge(object):
    def __init__(self, age):
        self._seconds = float(age)
        self._earth_year = 31557600

    def on_mercury(self):
        return round(self._seconds / self._earth_year / 0.2408467, 2)

    def on_venus(self):
        return round(self._seconds / self._earth_year / 0.61519726, 2)

    def on_earth(self):
        return round(self._seconds / self._earth_year, 2)

    def on_mars(self):
        return round(self._seconds / self._earth_year / 1.8808158, 2)

    def on_jupiter(self):
        return round(self._seconds / self._earth_year / 11.862615, 2)

    def on_saturn(self):
        return round(self._seconds / self._earth_year / 29.447498, 2)

    def on_uranus(self):
        return round(self._seconds / self._earth_year / 84.016846, 2)

    def on_neptune(self):
        return round(self._seconds / self._earth_year / 164.79132, 2)

@@ -336,25 +336,24 @@
        self.
-_
 seconds = fl
@@ -442,33 +442,32 @@
 turn round(self.
-_
 seconds / self._
@@ -536,33 +536,32 @@
 turn round(self.
-_
 seconds / self._
@@ -631,33 +631,32 @@
 turn round(self.
-_
 seconds / self._
@@ -712,33 +712,32 @@
 turn round(self.
-_
 seconds / self._
@@ -808,33 +808,32 @@
 turn round(self.
-_
 seconds / self._
@@ -903,33 +903,32 @@
 turn round(self.
-_
 seconds / self._
@@ -998,33 +998,32 @@
 turn round(self.
-_
 seconds / self._
@@ -1102,17 +1102,16 @@
 nd(self.
-_
 seconds 

Change variable name as per test methord