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-rwxr-xr-xchallenge-256/sgreen/python/ch-1.py35
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+#!/usr/bin/env python3
+
+import sys
+
+
+def count_pairs(words: list) -> int:
+ """Count the number of pairs of strings where one is reversed
+
+ Args:
+ words (list): A list of words
+
+ Returns:
+ int: The number of pairs
+ """
+ count = 0
+
+ while words:
+ # Take one word from the list
+ word = words.pop()
+
+ # See if the reverse of it is also in the list
+ if word[::-1] in words:
+ count += 1
+
+ # Return the number of pairs
+ return count
+
+
+def main():
+ result = count_pairs(sys.argv[1:])
+ print(result)
+
+
+if __name__ == '__main__':
+ main()