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2. What does -> mean in Python function definitions? - Stack...

   stackoverflow.com/questions/14379753

   Simply -> is introduced to get developers to optionally specify the return type of the function. See Python Enhancement Proposal 3107. This is an indication of how things may develop in future as Python is adopted extensively - an indication towards strong typing - this is my personal observation.

3. What is a DEF function for Python - Stack Overflow

   stackoverflow.com/questions/18711139

   14. def isn't a function, it defines a function, and is one of the basic keywords in Python. For example: return number * number. Will display: In the above code we can break it down as: The following newline and indent then declare the intentation level for the rest of the function.

4. oop - What do __init__ and self do in Python? - Stack Overflow

   stackoverflow.com/questions/625083

   The __init__ method gets called after memory for the object is allocated: x = Point(1,2) It is important to use the self parameter inside an object's method if you want to persist the value with the object. If, for instance, you implement the __init__ method like this: class Point: def __init__(self, x, y): _x = x.

5. python - What is the purpose of the `self` parameter? Why is it...

   stackoverflow.com/questions/2709821

   Python is designed to allow methods or functions to be defined in a context where both implicit this (a-la Java/C++) or explicit @ (a-la ruby) wouldn't work. Let's have an example with the explicit approach with python conventions: def fubar(x): self.x = x class C: frob = fubar

6. python - What do *args and **kwargs mean? - Stack Overflow

   stackoverflow.com/questions/287085

   282. Putting *args and/or **kwargs as the last items in your function definition’s argument list allows that function to accept an arbitrary number of arguments and/or keyword arguments. For example, if you wanted to write a function that returned the sum of all its arguments, no matter how many you supply, you could write it like this:

7. python - Why use def main()? - Stack Overflow

   stackoverflow.com/questions/4041238

   It will be possible to import that python code as a module without nasty side-effects. This means it will be possible to run tests against that code. This means we can import that code into an interactive python shell and test/debug/run it. Variables inside def main are local, while those outside it are global. This may introduce a few bugs and ...

8. python - What does def main () -> None do? - Stack Overflow

   stackoverflow.com/questions/38286718

   85. As is, it does absolutely nothing. It is a type annotation for the main function that simply states that this function returns None. Type annotations were introduced in Python 3.5 and are specified in PEP 484. Annotations for the return value of a function use the symbol -> followed by a type. It is completely optional and if you removed it ...

9. What does asterisk * mean in Python? - Stack Overflow

   stackoverflow.com/questions/400739

   All of the above answers were perfectly clear and complete, but just for the record I'd like to confirm that the meaning of * and ** in python has absolutely no similarity with the meaning of similar-looking operators in C. They are called the argument-unpacking and keyword-argument-unpacking operators.

10. python - What does if __name__ == "__main__": do? - Stack...

    stackoverflow.com/questions/419163

    This means that if __name__ is equal to __main__ then the file must be the main file and must actually be running (or it is the interpreter), not a module or package imported into the script. If indeed __name__ does take the value of __main__ then whatever is in that block of code will execute.

11. What does the “at” (@) symbol do in Python? - Stack Overflow

    stackoverflow.com/questions/6392739

    An @ symbol at the beginning of a line is used for class and function decorators: PEP 318: Decorators. Python Decorators - Python Wiki. The most common Python decorators are: @property. @classmethod. @staticmethod. An @ in the middle of a line is probably matrix multiplication: @ as a binary operator.