Add Python implementation for single_number

Author: Charliiee

BitManipulation/single_number/single_number.py

@@ -0,0 +1,16 @@
+def single_number(numbers):
+    single = 0
+
+    for number in numbers:
+        single ^= number
+
+    return single
+
+
+if __name__ == "__main__":
+    numbers = [3, 4, 2, 1, 3, 1, 4]
+    assert single_number(numbers) == 2
+    numbers = input("Enter list of repeated numbers: ")
+    numbers = map(int, numbers.split())
+    print(single_number(numbers))
+