🏣 Clean up for arxiv

book/ebook_src/bitwise_operations/bit_array.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+''' Example of how to use a bit array in python as a "counter" dict'''
+
+def print_dupl_ba(l1):
+    '''
+    >>> l1 = [0, 1, 2, 3, 4, 2, 6, 7, 8, 9]
+    >>> print_dupl_ba(l1)
+    2
+    '''
+
+    bs = bytearray(10)
+    for i in range(len(l1)):
+        if i == l1[i]:
+            bs[i] = 1
+    for index, bit in enumerate(bs):
+        if bit == 0:
+            return l1[index]
+    return None
+
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()
+