method-signatures | function declarations with signatures , no source filter
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Method and function declarations with signatures, no source filter
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QUESTION
When editing a file in PyCharm, once you've typed a class/method/function name and an opening bracket, a pop-up appears with the parameter information. You can press Ctrl+P to make it appear if it doesn't automatically.
However, this doesn't happen when working in a PyCharm Python Console; the parameter information doesn't appear automatically and Ctrl+P doesn't make it appear.
Is there a way to make this happen or a setting to turn it on? Or is it a limitation of the Python console?
Other references:
The official documentation for viewing reference information doesn't mention the console or discuss limitations between it and the main editor: https://www.jetbrains.com/help/pycharm/viewing-reference-information.html
This question is related: How do I get PyCharm to show method signatures and documentation in the Python/IPython console and the editor? , but the answers only apply to the PyCharm editor (and possibly the IPython console).
To be clear: I am asking about the "normal" console, not the IPython console.
I could well imagine it's a limitation of the Python console, except what's puzzling is that the console can do basic code completion with Ctrl+Space, which shows classes/methods/functions that are available in the namespace, including showing a preview of methods/function signatures:
...ANSWER
Answered 2019-Sep-29 at 22:21It's a known issue, please vote for https://youtrack.jetbrains.com/issue/PY-36610
QUESTION
{-# LANGUAGE DefaultSignatures #-}
class C a where
f :: [a]
default f :: (Num a) => [a]
f = [1,2,3,4,5]
...ANSWER
Answered 2017-Nov-05 at 13:15If you're using GHC 8.0.2 then you should write it in different way because there was type checker regression for those kinds of types. See notes:
https://downloads.haskell.org/~ghc/8.0.2/docs/html/users_guide/8.0.2-notes.html
So you need to write it like this:
QUESTION
I have java code like compiles fine.
...ANSWER
Answered 2017-Jun-02 at 16:37Your problem is that Int
and java.lang.Integer
are two different things. create
expects its first and third parameters to be of the same type as the type parameter. You are specifying the param as Integer
but arguments you are passing in - 1 and 4 - are of type Int
.
You cannot create Range[Int]
, because the type parameter is required to extend Number
and Comparable
, which Int
does not. So, you have to wrap your Int
s into Integer
explicitly
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