PowerShell will actually treat any comma-separated list as an array: So the @ is optional in those cases. However, for associative arrays, the @ is required: Officially, @ is the “array operator.” You can read more about it in the documentation that installed along with PowerShell, or in a book like “Windows PowerShell: TFM,” which … Read more
++x is called preincrement while x++ is called postincrement.
it means ‘nothing for the first argument, nothing for the second, and jump by three’. It gets every third item of the sequence sliced. Extended slices is what you want. New in Python 2.3
An @ symbol at the beginning of a line is used for class, function and method decorators. Read more here: PEP 318: Decorators Python Decorators The most common Python decorators you’ll run into are: @property @classmethod @staticmethod If you see an @ in the middle of a line, that’s a different thing, matrix multiplication. See this answer showing the use of @ as … Read more
ternary operator ? : is just short form of if/else Or
It means not equal to. It was taken from ABC (python’s predecessor) see here: x < y, x <= y, x >= y, x > y, x = y, x <> y, 0 <= d < 10 Order tests (<> means ‘not equals’) I believe ABC took it from Pascal, a language Guido began programming with. It has now been removed in … Read more
A static variable inside a function keeps its value between invocations. A static global variable or a function is “seen” only in the file it’s declared in (1) is the more foreign topic if you’re a newbie, so here’s an example: This prints: This is useful for cases where a function needs to keep some … Read more
Math object reference Examples Positive Negative Positive – Larger numbers Negative – Larger numbers
Yes, they do completely different things. pass simply does nothing, while continue goes on with the next loop iteration. In your example, the difference would become apparent if you added another statement after the if: After executing pass, this further statement would be executed. After continue, it wouldn’t.
I notice that I can do things like 2 << 5 to get 64 and 1000 >> 2 to get 250. Also I can use >> in print: What is happening here?