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You haven't explained how you expect that the assignment will produce the result you claim. I suspect that you expect node.next to resolve differently from the formal definition.

If you resolve the node references to their single-letter equivalents, the sequence of assignments looks something like this:

Write the result of the hello_world_photoshop.py into a file and read it in the photoshop script.

I don't really know if the File(batPath).execute(); waits for the end of the execution or not. If it does, then you can read the resulting file after this line. If it does not wait, then you could put the execution of javascript to an infinite loop of pauses and checks for a result file updates.

The issue was with memory. This line was fixed by reading the file in chunks.

One simple solution can be :

The error has nothing to do with your version of python and it's not an issue with the repo. From what I can tell, you are trying to run the app from C:\Users\osty2\Documents\programing_projects, which has no imgs folder.

Navigate to C:\Users\osty2\Documents\programing_projects\NEAT-flappy-bird and then run it. The application will then be able to see the imgs folder.

Your problem is that search_var was expiring when the main function completed so, whatever updates you were telling it to do also expired. The reason why @acw1668 solution worked is because the lambda is keeping the reference alive. This could have also been accomplished with the global keyword, although I like acw1668's approach a bit more as it gives a modicum of encapsulation. However, abusing lambda just to keep arbitrary references alive is not a good design choice. Also, if you were doing this in a loop with multiple recurring references, as that lambda currently stands, only the very last reference would be kept alive.

Here is what the global approach would have looked like

This answer is about Python 3.6.

The state is only changed by the gen.randint(1, 1) call, so let's see what it calls under the hood.

1. Here is the implementation of random.Random.randint:

Even though your solution is correct. But they are checking the value of format_string because that is what should contain the string format. To be sure you can try changing the variable name and see if you can reproduce the error that way.

Ps- Look at it this way, if you are just printing your statement, you will have to rewrite the complete statement (the c-style formatted string) every time you want it printed. But if you save it in a variable, you can just use that variable whenever you want. They are trying to teach you to write better code and do away with redundant code blocks.

edit: The exercise maker also wants you to use tuples to store your values. data = ("John", "Doe", 53.44) <-- This is a tuple. And it decreases variable declarations and a few lines of code.

tl;dr: Protocol may be the closest feature that's implemented, but it's still not sufficient for what you need. See this issue for details.

Full answer:

I think the closest feature to what you're asking for is Protocol, which was introduced in Python 3.7 (and backported to 3.6 via typing_extensions). It allows you to define a Protocol subclass that describes the behaviors of the type, pretty much like an "interface" or "trait" in other languages. For functions, a similar syntax is supported: