Hide input cells #32. That would make the ability to mix hidden python stuff with purposefully displayed python. I struggled with this, too. My first attempt was for a talk at EuroPython 2014 (Brainwaves for Hackers) where I hacked the live_reveal extension to interpret skip (from the slideshow-toolbar) as hide input.
An ISO file is a complete copy of a CD or DVD. You can create ISO images yourself or download them from the Internet. For example, Linux distributions offer freely downloadable ISO files that you can burn to disc. You can use an ISO image in a variety of ways. The ISO file itself is a backup of a disc, so you can use the ISO file if you ever lose or damage the original disc CDs Are Not Forever: The Truth About CD/DVD Longevity, Mold & Rot .
ISO is the abbreviation of International Organization for Standardization originated from Greek ISOS which means Equal. Though non-governmental, ISO is still a very important global organization. In reference to video, ISO refers to a file format of an optical disc such as CD, DVD or Blu-ray Disc. ISO actually owned its name from the ISO 9660 file system and is used together with CD-ROM media.