typing

When declaring a dictionary as a literal, is there a way to type-hint what value I am expecting for a specific key? And then, for discussion: are there guiding principles around dictionary typing in Python? I'm wondering whether it is considered bad practice to mix types in dictionaries. Here's an example: Consider the declaration of a dictionary in a class's __init__ : (disclaimer: I realize in the example, some of the .elements entries would probably be more appropriate as class attributes, but it's for the sake of the example). class Rectangle: def __init__(self, corners: Tuple[Tuple[float,

What type are parameters without type like in the class TStringStream: function Read(var Buffer; Count: Longint): Longint; override; What is the type of Buffer parameter (is it a type of Pointer ?). Rob Kennedy I wrote an article about this very topic a few years ago: What is an untyped parameter? Untyped parameters are used in a few situations; the TStream.Read method you ask about most closely matches with the Move procedure I wrote about. Here's an excerpt: procedure Move(const Source; var Dest; Count: Integer); The Move procedure copies data from an arbitrary variable into any other

Does F# have a Nominative Type System or a Structural Type System? I know that OCaml is structurally typed, though F# doesn't seems to be so, is this correct? F# is nominative. You can do a few structural tricks via some exotic mechanisms, but the type system of the language is primarily nominative. 来源： https://stackoverflow.com/questions/3137512/f-nominative-or-structural-typed

I'm trying to write code that validates type hints, and in order to do so I have to find out what kind of object the annotation is. For example, consider this snippet that's supposed to tell the user what kind of value is expected: import typing typ = typing.Union[int, str] if issubclass(typ, typing.Union): print('value type should be one of', typ.__args__) elif issubclass(typ, typing.Generic): print('value type should be a structure of', typ.__args__[0]) else: print('value type should be', typ) This should print "value type should be one of (int, str)", but instead it throws an exception:

I want to use an OrderedDict where the key is a Enum and where the item is a certain class. How do I use the typing module to hint this? What is the analog to this hinted namedtuple:: Move = typing.NamedTuple('Move', [('actor', Actor), ('location', Location)]) As noted in a comment by AChampion, you can use MutableMapping : class Actor(Enum): # ...Actor enum menbers... class Location: # ...Location class body... class MapActor2Location(OrderedDict, MutableMapping[Actor, Location]): pass Addendum for people like me who haven't used the typing module before: note that the type definitions use

I'm trying to use jquery in my angular2 project which is getting build with webpack . I got the webpack angular2 starter kit from here : here However ,I can't figure out how to get rid of these errors as my build is failing because of them . This is my typings.json { "globalDependencies": { "angular-protractor": "registry:dt/angular-protractor#1.5.0+20160425143459", "angular2-beta-to-rc-alias": "file:./node_modules/@angularclass/angular2-beta-to-rc-alias/src/beta-17/typings.d.ts", "core-js": "registry:dt/core-js#0.0.0+20160317120654", "hammerjs": "registry:dt/hammerjs#2.0.4+20160417130828",

I'd like to type something in a IFrame with Selenium IDE but I don't know how to do this. Thanks a lot! You have to select the iframe and then type selenium.selectFrame("css=iframe.widget[<a_css_identifier>]"); selenium.type(<your_object_or_text_box>, <typed_content>); The statements are in java, but you should be able to find selectFrame and type in the IDE. You can use the Selenium IDE command 'selectFrame' to focus within an iframe. Use the Target field to enter the iframe id. Try <tr> <td>selectFrame</td> <td>edit</td> <td></td> </tr> <tr> <td>type</td> <td>xpath=//html/body</td> <td>my

Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 8 years ago . It has recently been brought to my attention that my typing skills leave much to be desired. I've been programming a few years in college now, and typing speed has never been very important. Classes do not focus on how much code you can output, but instead how to design and implement code. Now that I have a job however, demands have changed slightly and I think it in my benefit to increase my typing skills, at