scotty | Transports to any directory

In the right-hand side of type synonyms, you can't just make up type variable names out of the blue the way you can in most other places. You'd need to explicitly quantify it by specifying forall m, like this:

• As a note, this is not the correct way to visualize growth rate. The plot implies linear growth, because you're just plotting a line between two points. Growth rate should be determine based on the intermediate count on other dates.
• The error was occurring at plt.plot(x1, y1,...), because x1 was the length d in dates (which is 2), but y1 was a length of 6060000.
• Use pandas.DataFrame.iterrows to iterate through and plot each observation.
• Each list for x and y of plot is comprised of 2 values
  • x always begins at the creation date, and ends at now
  • y always begins at 0, and ends at the subscriber count

Remarks:

• don't use reserved words for variable names, e.g. use tpl rather than tuple
• remove the for element in tuple: loop
• to access second element of tuple, use tpl[1] instead of [1]
• use elif instead else

Corrected code:

And do you understand why? You're not adding to a list. Every time through the list, you destroy the previous player_stats and create a new one with this row. You need to add player_stats = [] before the loop, and use

I will assume you meant to indent the line with json further.

You can use mutable variables in IO for that, e.g. IORef:

But names is an array and not == 0

You might mean

Don’t do regularLine.remove(input) do regularLine.remove(chosenNames) and the same for fastTrack but with append. You can put this in an if statement which checks if “chosenNames in regularLine” and if you want to remove multiple names then I would do this code:

Truly understanding monads takes time, practice, and patience, but it shouldn't be too hard to understand the need for liftIO by examining your types.

First off, the type of liftIO is MonadIO m => IO a -> m a. This means that the function can convert any IO action into an action in the monad m so long as m has an instance of MonadIO. In theory, this can only be implemented if m has some way of processing IO actions, so this function is embedding the given action into the m monad.

You're definitely in the right sort of place to use liftIO, so why isn't it working? That is, you have a value getAllFilePaths2 path of type IO [String], and you'd like it to be a value of type ScottyM [String] — this indeed seems like a good place to use liftIO. However, ScottyM is not an instance of MonadIO, as that error message you saw is trying to tell you, so you can't use liftIO.

This may seem crazy—can you really not embed IO actions into ScottyM?—but there's actually a good reason for this. What happens if the IO action throws an error? Does your whole web app crash? It would if you naively used liftIO. Instead, scotty provides the function liftAndCatchIO, which, as the docs describe, is "Like liftIO, but catch any IO exceptions and turn them into Scotty exceptions." This is the preferred way to embed IO actions into Scotty.

And here comes the final gotcha: Note that liftAndCatchIO actually produces values of type ActionM a, not ScottyM a. Additionally, there's no way to take a value in the ActionM monad and get it into the ScottyM monad. Instead, you need to use that value as an action. So, I'm not sure what pathsToScotty does, but it's very likely that you'll need to rewrite it.

You can use the authIsProtected field of the AuthSettings to define a function Request -> IO Bool that determines if a particular (Wai) Request is subject to authorization by basic authentication. In particular, you can inspect the URL path components and make a determination that way.

Unfortunately, this means that the check for authorization is completely separated from the Scotty routing. This works fine in your case but can make fine-grained control of authorization by Scotty route difficult.

Anyway, the AuthSettings are the overloaded "My Realm" string in your source, and according to the documentation, the recommended way of defining the settings is to use the overloaded string to write something like: