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Expand Up @@ -23,11 +23,11 @@ programs necessary for running your Python web application.


## Why are operating systems necessary?
An operating system makes many the computing tasks we take for granted easy.
An operating system makes many of the computing tasks we take for granted easy.
For example, the operating system enables writing to files,
communicating over a network and running multiple programs at once.
Otherwise you'd need to control the CPU, memory, network, graphics card,
and many other components with your own low-level implemention.
and many other components with your own low-level implementation.

Without using an existing operating system like Linux, Mac OS X, or Windows,
you'd be forced to write a new operating system as part of your web
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