Update power_using_recursion.py

Author: cclauss

maths/power_using_recursion.py

@@ -17,14 +17,27 @@ def power(base: int, exponent: int) -> float:
     """
     Calculate the power of a base raised to an exponent.
 
-    Examples:
     >>> power(3, 4)
     81
     >>> power(2, 0)
     1
     >>> all(power(base, exponent) == pow(base, exponent)
     ...     for base in range(-10, 10) for exponent in range(10))
     True
+    >>> power('a', 1)
+    'a'
+    >>> power('a', 2)
+    Traceback (most recent call last):
+        ...
+    TypeError: can't multiply sequence by non-int of type 'str'
+    >>> power('a', 'b')
+    Traceback (most recent call last):
+        ...
+    TypeError: unsupported operand type(s) for -: 'str' and 'int'
+    >>> power(2, -1)
+    Traceback (most recent call last):
+        ...
+    RecursionError: maximum recursion depth exceeded
     """
     return base * power(base, (exponent - 1)) if exponent else 1