What does -> mean in Python function definitions? - Stack Overflow
2013年1月17日 · funcdef: 'def' NAME parameters ['->' test] ':' suite The optional 'arrow' block was absent in Python 2 and I couldn't find any information regarding its meaning in Python 3. It …
What is a DEF function for Python - Stack Overflow
2013年9月10日 · I am new to coding Python and I just can't seem to understand what a Def function is! I have looked and read many tutorials on it and I still don't quite understand. Can …
What does asterisk * mean in Python? - Stack Overflow
I find * useful when writing a function that takes another callback function as a parameter: def some_function(parm1, parm2, callback, *callback_args): a = 1 b = 2 ...
python - Why use def main()? - Stack Overflow
2010年10月28日 · 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 …
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 …
What does the “at” (@) symbol do in Python? - Stack Overflow
2011年6月17日 · Python decorator is like a wrapper of a function or a class. It’s still too conceptual. def function_decorator(func): def wrapped_func(): # Do something before the …
python - What does ** (double star/asterisk) and * (star/asterisk) …
2008年8月31日 · It's also worth noting that you can use * and ** when calling functions as well. This is a shortcut that allows you to pass multiple arguments to a function directly using either …
python - Meaning of a function "-> str" - Stack Overflow
Those are type hints. Various type checkers can use them to determine if you're using the correct types. In your example, you function is expecting ham of type str, and eggs of type str …
What does the percentage sign mean in Python [duplicate]
2017年4月25日 · What does the percentage sign mean? It's an operator in Python that can mean several things depending on the context. A lot of what follows was already mentioned (or …
python - Why do some functions have underscores "__" before …
from M import * does not import objects whose name starts with an underscore. single_trailing_underscore_: used by convention to avoid conflicts with Python keyword, e.g. …