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-rw-r--r--gerbonara/utils.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/gerbonara/utils.py b/gerbonara/utils.py
index 586232a..83dc471 100644
--- a/gerbonara/utils.py
+++ b/gerbonara/utils.py
@@ -68,6 +68,9 @@ class LengthUnit:
self.shorthand = shorthand
self.factor = this_in_mm
+ def __hash__(self):
+ return hash((self.name, self.shorthand, self.factor))
+
def convert_from(self, unit, value):
""" Convert ``value`` from ``unit`` into this unit.