Correct way to define Python source code encoding

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PEP 263 defines how to declare Python source code encoding.

Normally, the first 2 lines of a Python file should start with:

#!/usr/bin/python
# -*- coding: <encoding name> -*-

But I have seen a lot of files starting with:

#!/usr/bin/python
# -*- encoding: <encoding name> -*-

=> encoding instead of coding.

So what is the correct way of declaring the file encoding?

Is encoding permitted because the regex used is lazy? Or is it just another form of declaring the file encoding?

I"m asking this question because the PEP does not talk about encoding, it just talks about coding.

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