From 9fb0cd271efec0fc651a5143aedda42f3dc93ea8 Mon Sep 17 00:00:00 2001
From: Dale Dai <145884899+CouldNot@users.noreply.github.com>
Date: Fri, 13 Oct 2023 23:47:08 -0700
Subject: [PATCH] Expand euler phi function doctest (#10401)

---
 maths/basic_maths.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/maths/basic_maths.py b/maths/basic_maths.py
index 26c52c549..c9e3d00fa 100644
--- a/maths/basic_maths.py
+++ b/maths/basic_maths.py
@@ -98,7 +98,17 @@ def euler_phi(n: int) -> int:
     """Calculate Euler's Phi Function.
     >>> euler_phi(100)
     40
+    >>> euler_phi(0)
+    Traceback (most recent call last):
+        ...
+    ValueError: Only positive numbers are accepted
+    >>> euler_phi(-10)
+    Traceback (most recent call last):
+        ...
+    ValueError: Only positive numbers are accepted
     """
+    if n <= 0:
+        raise ValueError("Only positive numbers are accepted")
     s = n
     for x in set(prime_factors(n)):
         s *= (x - 1) / x