1.9 Locking Options
When you go to the library to check out a book (not this one, because you bought a copy, right?), no one else can check it out again until you turn it back in.
The reason for this is simple: when the library has only one copy of the book, it can’t physically give it to more than one person at a time. When a lot of people first hear the word check out and that it relates to version control, they automatically think that version control must be like a library—only one person making changes at a time.
Some VCSs do work like this. You ask the repository if you can
have the settings.py file to make some
changes. It says yes and then prevents everyone else from
making changes until you check it back in.
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