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Bookmark or Share- What does -> mean in Python function definitions? - Stack Overflowfuncdef: '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 turns out this is correct Python and it's accepted by the interpreter: def f(x) -> 123: return x I thought that this might be some kind of a precondition syntax, but:
- .def files C/C++ DLLs - Stack OverflowThe 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 new api in the dll, then the linker looks at your .def file genearate the ordinal number for the ne wapi such that the ordinal numbers for the old apis are intact.
- Why should we use -> in def __init__ (self, n) -> None:?It comes down to the fist sentence in PEP 484 - The meaning of annotations Any function without annotations should be treated as having the most general type possible, or ignored, by any type checker. def __init__(self, n): won't be checked but def __init__(self, n) -> None: will.
- Why Python allows def functions inside for loop - Stack OverflowWell because python is a high level programming language, you can actually return functions. The following a simple yet demonstrative function.
- What is a DEF function for Python - Stack OverflowI 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 somebody explain to me what it is, what I use it for, and give me some examples. For the examples please make them easy and understandable for a newb to Python. Thanks!
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