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osmocom.utils: Make 'hexstr' type hashable

otherwise we couldn't use hexstr values as dict keys, for example

Change-Id: Ic9e1f8af1db436af5456fe5964133a144c9e066b
---
M src/osmocom/utils.py
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/python/pyosmocom refs/changes/04/38204/1

diff --git a/src/osmocom/utils.py b/src/osmocom/utils.py
index a218e1b..009eb04 100644
--- a/src/osmocom/utils.py
+++ b/src/osmocom/utils.py
@@ -41,6 +41,10 @@
         # make sure comparison is done case-insensitive
         return str(self) == other.lower()
 
+    def __hash__(self):
+        # having a custom __eq__ method will make the type unhashable by default, lets fix that
+        return hash(str(self))
+
     def __getitem__(self, val) -> 'hexstr':
         # make sure slicing a hexstr will return a hexstr
         return hexstr(super().__getitem__(val))

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