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venv/Lib/site-packages/fontTools/misc/intTools.py

@@ -0,0 +1,25 @@
+__all__ = ["popCount"]
+
+
+try:
+    bit_count = int.bit_count
+except AttributeError:
+
+    def bit_count(v):
+        return bin(v).count("1")
+
+
+"""Return number of 1 bits (population count) of the absolute value of an integer.
+
+See https://docs.python.org/3.10/library/stdtypes.html#int.bit_count
+"""
+popCount = bit_count
+
+
+def bit_indices(v):
+    """Return list of indices where bits are set, 0 being the index of the least significant bit.
+
+    >>> bit_indices(0b101)
+    [0, 2]
+    """
+    return [i for i, b in enumerate(bin(v)[::-1]) if b == "1"]