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diff --git a/challenge-273/luca-ferrari/python/ch-1.py b/challenge-273/luca-ferrari/python/ch-1.py
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+++ b/challenge-273/luca-ferrari/python/ch-1.py
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+#!python
+
+#
+# Perl Weekly Challenge 273
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-273>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def task_1( args ):
+    s = args[ 0 ]
+    c = args[ 1 ]
+
+    return round( len( list( filter( lambda x: x == c, s ) ) ) / len( s ) * 100 )
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_1( sys.argv[ 1: ] ) )