Merge branch 'manwar:master' into work

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diff --git a/challenge-260/luca-ferrari/python/ch-1.py b/challenge-260/luca-ferrari/python/ch-1.py
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+++ b/challenge-260/luca-ferrari/python/ch-1.py
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+#!python
+
+#
+# Perl Weekly Challenge 260
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-260>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def task_1( args ):
+    nums = list( map( int, args ) )
+    bag = {}
+
+    for n in nums:
+        occurrencies = len( list( filter( lambda x: x == n, nums ) ) )
+        if not n in bag:
+            bag[ n ] = occurrencies
+
+
+    for o in bag.values():
+        if len( list( filter( lambda x: x == o, bag.values() ) ) ) > 1:
+            return 0
+
+    return 1
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_1( sys.argv[ 1: ] ) )