zaz | Super simple HTTP Command Bus

Perform a self-lookup and check the result array is empty or not

If guess you mean that your test data['infos'] == i is never evaluated to True. Here you probably want to check that you must have in the infos field of your dictionary an item x such that x['name'] == i. If that's your problem you can instead replace your sum by:

Built on your attempt:

We can see that the index scan returned 250692 rows in order to find 5000 to lock. So apparently we had to skip over 49 other queries worth of locked rows. That is not going to be very efficient, although if static it shouldn't be as slow as you see here. But it has to acquire a transient exclusive lock on a section of memory for each attempt. If it is fighting with many other processes for those locks, you can get a cascading collapse of performance.

If you are launching 4 such statements per second with no cap and without waiting for any previous ones to finish, then you have an unstable situation. The more you have running at one time, the more they fight each other and slow down. If the completion rate goes down but the launch interval does not, then you just get more processes fighting with more other processes and each getting slower. So once you get shoved over the edge, it might never recover on its own.

The role of concurrent insertions is probably just to provide enough noisy load on the system to give the collapse a chance to take a foothold. And of course without concurrent insertion, your deletes are doing to run out of things to delete pretty soon, at which point they will be very fast.

The large majority of the time, a Python KeyError is raised because a key is not found in a dictionary or a dictionary subclass

-- check train_df test_df data-frame has column named 'Cabin' or not.

Here is an example,

Here is how you can use a dict() with more than one conversion:

Use re.findall in dot all mode:

You can simply use df.iloc. No need for as_matrix():

I suggest adding it as an environment variable at the time you deploy the function. These are used to configure function deployments so you don't have to hard code anything. You should also check to see if the automatically populated values are something you might want to use.