Solution to issue #18 in Python (#26)

* Solution to issue #18 in Python

* Modified the code,function created to allow passing the parameters

* Tests for issue #18 added. SKELETON CODE to test python(2.7) solutions created.

* Modification to 18.py

Comments in the code have been removed. for loop has been used as discussed.

* Modification to test18.py

Tests have been modified as per the modified code of 18.py . The code has been tested and it passed the test cases.

* Solution to issue #34 in Python 2.7

* Delete 34.py

* Delete test34.py

* print statement removed from solution

* Test skeleton moved from solutions to tests

* Test modified to eliminate redundancy. pythontest_skeleton modified with new changes. Name of solution changed from 18.py to sol18.py to avoid conflict while importing the file for testing

* Renamed test18.py to 18.py and deleted pythontest_skeleton

solutions/sol18.py

@@ -0,0 +1,17 @@
+#Himanshu Nachane (@Himanshu1495)
+'''return missing number in an input array of consecutively increasing numbers.
+
+i: [5,6,8,9]
+o: 7
+'''
+
+def missing_num(arr):
+	first_element = arr[0]
+	last_element = arr[-1]
+	new_sum = 0
+	for x in range(first_element,last_element+1):
+		new_sum += x
+	return new_sum - sum(arr)
+
+
+

test/18.py

@@ -0,0 +1,14 @@
+import sys
+sys.path.insert(0,'../solutions/')
+from sol18 import missing_num
+import unittest
+
+class MyTest(unittest.TestCase):
+    def test1(self):
+        self.assertEqual(missing_num([10,11,12,14,15,16]),13)
+    def test2(self):
+        self.assertEqual(missing_num([125,126,128,129,130]),127)
+    def test3(self):    
+        self.assertEqual(missing_num([1125,1127,1128,1129,1130]),1126)
+
+unittest.main()