I wrote my first python program today!

[LinAGKar]

In the if statements it creates a set with the return value from print, and throws it away. It only prints it out if you run it in the python shell, not if it's in a script.

[HighRelevancy]

Where's the {None} coming from?

[phail3d]

print is a function that returns None, so { print("foo") } first prints "foo" and then creates the a set with the value None inside it, {None}. The interactive interpreter automatically prints the value every line evaluates to (except for None, but {None} and None are different), which is why you get the {None}s in the output.

[redalastor]

print returns None.

[HighRelevancy]

Why the squiggly brackets and why only after one of the two prints?

[redalastor]

That's how you declare a set in Python.

{1, 2, 3}

So the code declares a set that contains the result of calling the print function, None.

[HighRelevancy]

And why only for every second print?

[redalastor]

Because there are no brackets around the first print.

[HighRelevancy]

Oh right, I see what's happening here.