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In Python arguments can be mainly of two kinds.

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We have known keyword arguments and we have keyword arguments.

3
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These two here are non keyword arguments.

4
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They don't have keyword attached to them.

5
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However if the case was this

6
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things would still work the same, but these two now would be called keyword arguments. Non keyword arguments

7
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which is this one two are also referred to as positional arguments.

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They are called positional arguments because the way you communicate these two arguments to the function

9
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definition is based on position.

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So the first position forgoes goes for a and the second 5 goes for B.

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So positional and non keyword arguments is the same thing.

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If it was keyword

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arguments,

14
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the position actually doesn't matter.

15
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So you can pass the value of B as the first argument if you like and 4 will go to B, and 5 will

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go to a.

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So as long as you pass them like that, keyword arguments the position doesn't matter.

18
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You still would get the same output.

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Now we also have default parameters, not arguments parameters.

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What that means is that a parameter might have a default value like that which means you don't have

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to specify the value of that argument when you call the function so we assign 5 to A and B is 6 by default.

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Therefore we get 30. A doesn't necessarily have to be a keyword argument.

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It can also be a non keyword argument here in the function call you still get the same output.

24
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Of course you can also assign different value to B.

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Just like that.

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And lastly you can also leave it like that two non keyword arguments and you still get the output correctly.

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Something you should know is that a default parameter can not be before non default parameters.

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If you execute that you'll get an error.

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It says non default argument follows default argument, 
so non default follows default argument which

30
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is A and that I think is some very good information about function arguments and parameters.