Merge pull request YearOfProgramming#360 from sarcodian/python_6 revi…

…ewed by ningyuansg

[Python] Challenge 6 (reviewed and merged)

challenge_6/python/sarcodian/src/challenge_6.py

@@ -0,0 +1,32 @@
+def ranges(int_list):
+    '''
+    int_list: list, containing intergers sorted from low to high
+    returns: list, each element is the first and last digit of a run
+        of consecutive numbers with the middle digits replaced by an
+        arrow.
+    '''
+    temp_list = []
+    final_list = []
+
+    if len(int_list) < 2:
+        return []
+
+    for i in range(len(int_list)):
+        if i == len(int_list)-1:
+            if int_list[i-1] == int_list[i]-1:
+                temp_list.append(int_list[i])
+                final_list.append(print_range(temp_list))
+        elif int_list[i] == int_list[i+1]-1:
+            temp_list.append(int_list[i])
+        else:
+            temp_list.append(int_list[i])
+            final_list.append(print_range(temp_list))
+            temp_list.clear()
+    return final_list
+
+def print_range(range_list):
+    '''
+    range_list: list, a list of consecutive integers
+    returns: string, first and last integer with arrow in the middle
+    '''
+    return '{}->{}'.format(range_list[0], range_list[-1])

challenge_6/python/sarcodian/src/challenge_6_tests.py

@@ -0,0 +1,28 @@
+# we start by importing the unittest module
+import unittest
+
+# Next lets import our function that we intend to do testing on
+#
+# **We could also import all functions by using * or just import the module
+# itself but for now lets just import the function
+from challenge_6 import ranges, print_range
+
+# lets define our suite of tests as a class and lets inherit from unittest.TestCase
+class TestBinaryMethods(unittest.TestCase):
+
+    # All tests must begin with the test_* naming scheme otherwise unittest won't find it
+    def test_positiveIntegers(self):
+        """ Tests from the READ.me """
+        # Testing input with only 1 return value
+        self.assertEqual(ranges([1, 2]), ["1->2"])
+
+# Testing input with no return value
+        self.assertEqual(ranges([1]), [])
+
+# Testing input with multiple return values
+        self.assertEqual(ranges([1,2,3,4,5,8,9,10]), ["1->5", "8->10"])
+
+# if the python file is ran by itself run unittest
+# This allows us to import the members of the file without running main if we need to
+if __name__ == '__main__':
+    unittest.main()