Even before Edison was born, scientists had experimented with making light bulbs. These bulbs burned out after a few minutes. What Edison invented was the first incandescent light that was practical, that would light for hours and hours. He and his muckers also had to invent hundreds of other parts to make the light bulbs in your home work. Light switches, electric meters, wiring--all these had to be invented too.
The pip command is a tool for installing and managing Python packages, such as those found in the Python Package Index. It's a replacement for easy_install.
The install command can also upgrade packages (as illustrated above in Upgrading pip) by including the -U or --upgrade option. Despite the --upgrade name, the option can be used anytime you need to change the version of an installed package, whether the new version is higher or lower than the installed version.