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+#!/usr/bin/env python3
+
+# Challenge 166
+#
+# Task 2: K-Directory Diff
+# Submitted by: Ryan J Thompson
+#
+# Given a few (three or more) directories (non-recursively), display a
+# side-by-side difference of files that are missing from at least one of the
+# directories. Do not display files that exist in every directory.
+#
+# Since the task is non-recursive, if you encounter a subdirectory, append a /,
+# but otherwise treat it the same as a regular file.
+# Example
+#
+# Given the following directory structure:
+#
+# dir_a:
+# Arial.ttf  Comic_Sans.ttf  Georgia.ttf  Helvetica.ttf  Impact.otf  Verdana.ttf
+# Old_Fonts/
+#
+# dir_b:
+# Arial.ttf  Comic_Sans.ttf  Courier_New.ttf  Helvetica.ttf  Impact.otf
+# Tahoma.ttf  Verdana.ttf
+#
+# dir_c:
+# Arial.ttf  Courier_New.ttf  Helvetica.ttf  Impact.otf  Monaco.ttf  Verdana.ttf
+#
+# The output should look similar to the following:
+#
+# dir_a          | dir_b           | dir_c
+# -------------- | --------------- | ---------------
+# Comic_Sans.ttf | Comic_Sans.ttf  |
+#                | Courier_New.ttf | Courier_New.ttf
+# Georgia.ttf    |                 |
+#                |                 | Monaco.ttf
+# Old_Fonts/     |                 |
+#                | Tahoma.ttf      |
+
+import os
+import sys
+
+WIDTH = 16
+
+def read_dir(dir):
+    try:
+        with os.scandir(dir) as entries:
+            return sorted((entry.name + '/' if entry.is_dir() else entry.name) for entry in entries if entry.name not in {'.', '..'})
+    except OSError as e:
+        print(f"opendir {dir}: {e}", file=sys.stderr)
+        sys.exit(1)
+
+def read_dirs(*dirs):
+    return [read_dir(dir) for dir in dirs]
+
+def print_line(*cells):
+    for i in range(len(cells)):
+        print(f"{cells[i]:<{WIDTH}}", end=" | " if i != len(cells) - 1 else "")
+    print()
+
+def print_diff(dirs, contents):
+    # print header
+    print_line(*dirs)
+    print_line(*(["-" * WIDTH] * len(dirs)))
+
+    # collect files
+    files = {}
+    files_dir = {}
+    for i, dir in enumerate(dirs):
+        for file in contents[i]:
+            files[file] = True
+            if file not in files_dir:
+                files_dir[file] = {}
+            files_dir[file][dir] = True
+
+    # print rows
+    for file in sorted(files.keys()):
+        row = [file if dir in files_dir.get(file, {}) else "" for dir in dirs]
+        if any(cell == "" for cell in row):
+            print_line(*row)
+
+if len(sys.argv) > 2:
+    print_diff(sys.argv[1:], read_dirs(*sys.argv[1:]))