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I'm new to crystal reports I'm trying to change the selected tables based on user input in SAP crystal reports but when I enter a value it shows an error message, this is the code :

I'm trying to create a toy R REPL written in R (here's the source code). Ideally I'd like the REPL to run in an R terminal itself, but neither to interfere nor to depend on anything that has already been evaluated at the global environment. Unfortunately, I haven't been able to do come up with a solution to this problem yet. One of the main challenges I'm facing refers to how package environments are attached.

According to Hadley's Advanced R, packages attached by library() and require() become parents of the global environment. This implies, however, that if I attach a package inside my toy REPL it will become the parent of the global environment even I'm not running it on the global environment.

For example (please note that the R> prompt is the "normal" R terminal, and that >>>> is my REPL's "terminal"):

I'm trying to request a user's customerId based on the user's uid, so that I can use that customerId for future reads/write within the application based on the denormalized structure of other collections.

Hi so I've implemented a method based on this answer: How to get notification in xamarin forms on firebase data change? But I'm having trouble getting it working.

Here's my code:

we are trying to run keycloak using postgres db as database in separate schema keycloak_schema an error has occured.

I am trying to use sqlalchemy-access library to insert a data frame into an access database:

The code that I have is:

I'm writing an event-driven program with the event scheduling written in C. The program uses Python for extension modules. I would like to allow extension modules to use async/await syntax to implement coroutines. Coroutines will just interact with parts of my program, no IO is involved. My C scheduler is single-threaded and I need coroutines to execute in its thread.

In a pure Python program, I would just use asyncio as is, and let my program use its event loop to drive all events. This is however not an option; my event loop needs to serve millions of C-based events per second and I cannot afford Python's overheads.

I tried to write my own event loop implementation, that delegates all scheduling to my C scheduler. I tried a few approaches:

• Re-implement EventLoop, Future, Task etc to imitate how asyncio works (minus IO), so that call_soon delegates scheduling to my C event loop. This is safe, but requires a bit of work and my implementation will always be inferior to asyncio when it comes to documentation, debugging support, intricate semantic details, and correctness/test coverage.
• I can use vanilla Task, Future etc from asyncio, and only create a custom implementation of AbstractEventLoop, delegating scheduling to my C event loop in the same way. This is pretty straightforward, but I can see that the vanilla EventLoop accesses non-obvious internals (task._source_traceback, _asyncgen_finalizer_hook, _set_running_loop), so my implementation is still second class. I also have to rely on the undocumented Handle._run to actually invoke callbacks.
• Things appeared to get simpler and better if I subclassed from BaseEventLoop instead of AbstractEventLoop (but docs say I shouldn't do that). I still need Handle._run, though.
• I could spawn a separate thread that run_forever:s a vanilla asyncio.DefaultEventLoop and run all my coroutines there, but coroutines depend on my program's extension API, which does not support concurrent calls. So I must somehow make DefaultEventLoop pause my C event loop while calling Handle._run(). I don't see a reasonable way to achieve that.

Any ideas on how to best do this? How did others solve this problem?

I'm new to the sk-learn pipeline and would like use my own form of discretized binning. I need to bin a column of values based on the cumulative sum of another column associated with the original column. I have a working function:

I have the entity "Teacher", which can create courses. The problem is that when creating a course, for some reason it does not remember the teacher who created it. The teacher himself does not have this course either. The update method doesn't help the teacher.