What is a None value?

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I have been studying Python, and I read a chapter which describes the None value, but unfortunately this book isn"t very clear at some points. I thought that I would find the answer to my question, if I share it there.

I want to know what the None value is and what do you use it for?

And also, I don"t get this part of the book:

Assigning a value of None to a variable is one way to reset it to its original, empty state.

What does that mean?

The answers were great, although I didn"t understand most of answers due to my low knowledge of the computer world (I haven"t learned about classes, objects, etc.). What does this sentence mean?

Assigning a value of None to a variable is one way to reset it to its original, empty state.

Final:

Finally I"ve got my answer from looking to different answers. I must appreciate all the people who put their times to help me (especially Martijn Pieters and DSM), and I wish that I could choose all answers as the best, but the selection is limited to one. All of the answers were great.





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