Solutions 074 Python LK

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diff --git a/challenge-074/lubos-kolouch/python/ch_2.py b/challenge-074/lubos-kolouch/python/ch_2.py
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+#!/usr/bin/env python
+""" FNR character from Perl weekly challenge 074 task 2 """
+
+
+# ===============================================================================
+#
+#        FILE: ch-_.py
+#
+#        USAGE: ./ch_2.py
+#
+#  DESCRIPTION: https://perlweeklychallenge.org/blog/perl-weekly-challenge-074/
+#
+#               TASK #2 › FNR Character
+#
+#       AUTHOR: Lubos Kolouch
+#      VERSION: 1.0
+#      CREATED: 08/22/2020 12:40:09 PM
+# ===============================================================================
+
+
+def get_fnr(in_str):
+    """ Find and return the FNR in the given string """
+
+    fnr_count = dict()
+    fnr_queue = list()
+
+    result = ''
+
+    for char in in_str:
+        fnr_count[char] = fnr_count.get(char, 0) + 1
+
+        if fnr_count[char] == 1:
+            fnr_queue.append(char)
+        else:
+            fnr_queue.remove(char)
+
+        if fnr_queue:
+            result += fnr_queue[-1]
+        else:
+            result += '#'
+
+    return result
+
+
+assert get_fnr('ababc') == 'abb#c'
+assert get_fnr('xyzzyx') == 'xyzyx#'