adding the looping function

ming/python/1_hello_world/hello_world.py

@@ -0,0 +1,8 @@
+#!/bin/python3
+#
+# https://www.hackerrank.com/challenges/py-hello-world/problem
+# print "Hello, World!" to stdout
+
+
+if __name__ == '__main__':
+    print("")

ming/python/2_if_else/if_else.py

@@ -0,0 +1,10 @@
+#!/bin/python3
+#
+# https://www.hackerrank.com/challenges/py-if-else/problem
+# Given a positive integer n where 1 <= n <= 100
+# If n is even and in the inclusive range of 6 to 20, print "Weird"
+# If n is even and greater than 20, print "Not Weird"
+
+
+if __name__ == '__main__':
+    n = int(input().strip())

ming/python/3_arithmetic_operators/arithmetic_operators.py

@@ -0,0 +1,14 @@
+#!/bin/python3
+#
+# https://www.hackerrank.com/challenges/python-arithmetic-operators/problem
+#
+# Read two integers from STDIN and print three lines where:
+#
+# The first line contains the sum of the two numbers.
+# The second line contains the difference of the two numbers (first - second).
+# The third line contains the product of the two numbers.
+
+
+if __name__ == '__main__':
+    a = int(input())
+    b = int(input())

ming/python/4_loops/loops.py

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+#!/bin/python3
+#
+# https://www.hackerrank.com/challenges/python-loops/problem
+#
+# For all non-negative integers i < n, print i^2.
+#
+# Sample Input:
+# 5
+#
+# Sample Output:
+# 0
+# 1
+# 4
+# 9
+# 16
+
+def looping(num):
+    for i in range(num):
+        print(square(i))
+
+
+def square(num):
+    return num**2
+
+
+if __name__ == '__main__':
+    n = int(input())
+    looping(n)

ming/python/4_loops/loops_test.py

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+#!/bin/python3
+
+import unittest
+
+from loops import square
+
+
+class TestSquare(unittest.TestCase):
+
+    def square_base_test(self, num, expected_outcome):
+        result = square(num)
+        self.assertEqual(result, expected_outcome)
+
+    def test_negative_num(self):
+        self.square_base_test(-1, 1)
+
+    def test_zero(self):
+        self.square_base_test(0, 0)
+
+    def test_one(self):
+        self.square_base_test(1, 1)
+
+    def test_five(self):
+        self.square_base_test(5, 25)
+
+    def test_ten(self):
+        self.square_base_test(10, 100)
+
+
+if __name__ == '__main__':
+    unittest.main()