Updated style [skip ci]

Author: ankane

pgvector/halfvec.py

@@ -57,7 +57,7 @@ def to_binary(self) -> bytes:
         else:
             value = array.array('H', self._value)
             value.byteswap()
-        return struct.pack(f'>HH', len(value), 0) + memoryview(value)
+        return struct.pack('>HH', len(value), 0) + memoryview(value)
 
     @classmethod
     def from_text(cls, value: str) -> HalfVector:

pgvector/vector.py

@@ -55,7 +55,7 @@ def to_binary(self) -> bytes:
         else:
             value = array.array('f', self._value)
             value.byteswap()
-        return struct.pack(f'>HH', len(value), 0) + memoryview(value)
+        return struct.pack('>HH', len(value), 0) + memoryview(value)
 
     @classmethod
     def from_text(cls, value: str) -> Vector: