Is narcissistic

maths/is_narcissistic.py

@@ -0,0 +1,24 @@
+def is_narcissistic(num: int) -> bool:
+
+    """
+      >>> is_narcissistic(1527)
+      False
+      >>> is_narcissistic(-1527)
+      False
+      >>> is_narcissistic(153)
+      True
+      >>> is_narcissistic("153")
+      True
+    """
+
+    """In number theory, a narcissistic number is a number that is 
+    the sum of its own digits each raised to the power of the number of digits.
+    this alogrithm finds out if given number 'num' is narcissistic or not"""
+
+    num = abs(int(num))
+    return sum([int(char)**len(str(num)) for char in str(num)]) == num
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()