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Splitting passwords

Given a password:

abcdefghijklmnopqrstuvwxyz

It is relatively easy to split it in half:

abcdefghijklm

nopqrstuvwxyz

The Github project hosting these documents has two utilities for splitting and joining a password using every-other character, like a zipper:

• otro.py will split a string into two, every-other-character strings

    $ otro.py abcdefghijklmnopqrstuvwxyz
    Given: abcdefghijklmnopqrstuvwxyz
     Even: acegikmoqsuwy
      Odd: bdfhjlnprtvxz
  

• intro.py will join two every-other-character strings into one

    $ intro.py acegikmoqsuwy bdfhjlnprtvxz
      Even: acegikmoqsuwy
       Odd: bdfhjlnprtvxz
    Result: abcdefghijklmnopqrstuvwxyz
  

(Forget that “even” and “odd” look mixed-up. It’s a counting from zero thing.)