tasks a-s

Task/Rot-13/Python/rot-13-1.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+import string
+def rot13(s):
+   """Implement the rot-13 encoding function: "rotate" each letter by the
+      letter that's 13 steps from it (wrapping from z to a)
+   """
+   return s.translate(
+       string.maketrans(
+           string.ascii_uppercase + string.ascii_lowercase,
+           string.ascii_uppercase[13:] + string.ascii_uppercase[:13] +
+           string.ascii_lowercase[13:] + string.ascii_lowercase[:13]
+           )
+       )
+if __name__ == "__main__":
+   """Peform line-by-line rot-13 encoding on any files listed on our
+      command line or act as a standard UNIX filter (if no arguments
+      specified).
+   """
+   import fileinput
+   for line in fileinput.input():
+      print rot13(line),  # (Note the trailing comma; avoid double-spacing our output)!

Task/Rot-13/Python/rot-13-2.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+import string
+def rot13(s):
+   """Implement the rot-13 encoding function: "rotate" each letter by the
+      letter that's 13 steps from it (wrapping from z to a)
+   """
+   return s.translate(
+       str.maketrans(
+           string.ascii_uppercase + string.ascii_lowercase,
+           string.ascii_uppercase[13:] + string.ascii_uppercase[:13] +
+           string.ascii_lowercase[13:] + string.ascii_lowercase[:13]
+           )
+       )
+if __name__ == "__main__":
+   """Peform line-by-line rot-13 encoding on any files listed on our
+      command line or act as a standard UNIX filter (if no arguments
+      specified).
+   """
+   import fileinput
+   for line in fileinput.input():
+      print(rot13(line), end="")