python - What does def main () -> None do? - Stack Overflow
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 …
How can I return two values from a function in Python?
I would like to return two values from a function in two separate variables. What would you expect it to look like on the calling end? You can't write a = select_choice(); b = select_choice() …
.def files C/C++ DLLs - Stack Overflow
Jul 21, 2014 · The advantage of def file is that, it helps you to maintain the backword compatibility with the already realsed dlls. i.e it maintains the ordinal numbers for apis. Suppose you add a …
How do I define a function with optional arguments?
def add(x,y): return x+ y # calling this will require only x and y add(2,3) # 5 If we want to add as many arguments as we may want, we shall just use *args which shall be a list of more …
python - Why do some functions have underscores - Stack Overflow
May 24, 2024 · The other respondents are correct in describing the double leading and trailing underscores as a naming convention for "special" or "magic" methods. While you can call …
How to use the def function in IF or ELSE/ ELIF satement in python?
Jan 3, 2016 · Yes you can but you have to do it right and add conditions after elif. Python programming references typically explain the syntax of if else elif very well and many other …
python - What is the purpose of the return statement? How is it ...
def f(x): return x + 2 That is: we def ine a function named f, which will be given an x value. When the code runs we figure out x + 2, and return that value. Instead of describing a relationship, …
What is the purpose of the `self` parameter? Why is it needed?
For a language-agnostic consideration of the design decision, see What is the advantage of having this/self pointer mandatory explicit?. To close debugging questions where OP omitted a …
What does the "at" (@) symbol do in Python? - Stack Overflow
What does the @ symbol do in Python?What's the syntactic or practical benefit of having decorators here, instead of (for example) just calling something like app.route("/", hello) …
Using len () and def __len__ (self): to build a class
Feb 27, 2013 · Just curious, Is there any difference (advantages and disadvantages) between using len () or def __len__ () when I build a class? And which is the best Python style? class …