Fixed error with Bit constructor and empty strings - fixes #165 and resolves #166

Co-authored-by: Zaakir Hussain <ZaakirHussain5@users.noreply.github.com>

Author: ankane

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 0.5.2 (unreleased)
 
+- Fixed error with `Bit` constructor and empty strings
 - Fixed equality for `HalfVector` with signed zeros
 
 ## 0.5.1 (2026-10-08)

pgvector/bit.py

@@ -34,7 +34,10 @@ def __init__(
                 value += '0' * (8 - (length % 8))
 
             self._length = length
-            self._data = int(value, 2).to_bytes(len(value) // 8, byteorder='big')
+            if length > 0:
+                self._data = int(value, 2).to_bytes(len(value) // 8, byteorder='big')
+            else:
+                self._data = b''
         elif is_ndarray(value):
             import numpy as np
 

tests/test_bit.py

@@ -27,6 +27,9 @@ def test_list_list(self) -> None:
     def test_str(self) -> None:
         assert Bit('101').to_list() == [True, False, True]
 
+    def test_str_empty(self) -> None:
+        assert Bit('').to_list() == []
+
     def test_str_two(self) -> None:
         with pytest.raises(ValueError) as error:
             Bit('201')