python – How do I use Rest Data Source API with access tokens?

I’m trying to get data back from an API without having to loop through an RDD, and I found the Rest Data Source Library on Git hub:

The issue I’m running into is how to incorporate Access Tokens in with parameter mapping. When it comes to the supported options the descriptions has this for the URL call: url: This is the uri of the target micro service. You can also provide the common parameters (those that don’t vary with each API call) in this url. This is a mandatory parameter. I’ve been trying to do this using python/pyspark if possible

So I have code structured like this:

Getting access token:

token_url = 'https://restful-website/oauth/token'

search_url = 'https://my_final_endpoint'

client_id = my_client_id

client_secret = my_client_secret

data = {'grant_type': 'client_credentials'}

access_token_response =, data = data, verify = False, allow_redirects = False
                                      , auth = (client_id, client_secret))
tokens = json.loads(access_token_response.text)
api_call_headers = {'Authorization': 'Bearer ' + tokens('access_token')}

expert_input_Df =, inferSchema = True, header = True)
*expert_prms_Soda = { 'url' : search_url
            , 'input' : 'test_expert'
            , 'method' : 'GET'
            , 'readTimeout' : '10000'
            , 'connectionTimeout' : '2000'
            , 'partitions' : '10'}
expert_returnDf =*'').options(**expert_prms_Soda).load()
spark.sql("select name, address, city_name from expert_table ").show()

What I would like to know is how do I get this to work with the access token? And ‘what common parameters are needed to get this to work. I’m stuck at this point and could use some guidance, please. This api call doesn’t take headers so I’m kind of stuck and I don’t want to have to use an RDD just to do this……

Send Form data to external url

I used to use the following code from within WordPress to let users look up which colleage company they have to contact based on their zipcode:

<form action=""
Zoek een Energiewacht servicepartner
<input class="search-field" name="zipcode" type="text" value="" placeholder="1234AB" />
<input type="submit" value="Zoek">

Unfortunately this code no longer works; when I click on “search” I see that the ‘siteurl’, in this case, is placed before the actual link.
Despite searching on, stack exchange etc. I cannot find a suitable solution.

Who can tell me how I can still send the zip code to the external website so that the customer can find the right colleague company there?
The external website uses a zip code module in a different CMS than WordPress.

plotting – Make a density plot from a file where the data makes a shape with a hole in it

I have a .dat file and I want to make preferably a density (or surface) plot with it.

ListDensityPlot(f, ColorFunction -> "Rainbow", Axes -> False, 
 Background -> Black, 
 PlotLegends -> 
  Placed(BarLegend(Automatic, LegendMargins -> {{0, 0}, {10, 6}}, 
    LegendMarkerSize -> {15, 300}, LegendLabel -> "F"), After) , 
 AspectRatio -> 0.5,  PlotRange -> All)

The data has the shape of a not perfectly round donut seen from above, so there’s a hole inside and the density and surface plot commands apply the color of the ColorFunction as if it’s 0 to the part in the center that corresponds to the hole.
Is there a way that the part in the middle doesn’t get colored? Or can I assign specifically black to the values that are “0” (but where in reality there’s not data) and still use the Color Function?

javascript – How do document databases (like mongodb) store data behind the scenes?

For a couple of reason which need not be mentioned here, because they are rather complex, I need to program my own NoSQL document database in node.js. However, I am quite confused as to what is the best way to store this data.

I’ve searched around on google, but most information is on how to use a database, not how to program one. The following questions were a blank on google:

  1. To me, the name “document database”, and the fact that the smallest unit of data is a “document”, implies that each one would be stored in an own file. Is this correct?

  2. Also, how are collections grouped together? Is each collection a folder of documents? Or a manifestation file pointing to different documents in a collection?

  3. How should relations between documents be implemented? Is it compliant to the term “NoSQL database” to even have a concept of relations?

  4. Should a NoSQL database contain a way to create schemas for documents, or should NoSQL databases be free-form and schema-less?

I would greatly appreciate it if anyone can answer these questions!👍

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nosql – Structuring data effectively on cloud firestore


There is N number of users and n number of user groups (N >= n) where each user belongs to a user group.

For example: group1 = (user1, user2), group2 = (user3, user4, user5), etc.

How to structure this in a NoSQL database?

The main issue here is that in some cases I need to know about a user which group it belongs to. I can get the user’s id from firebase authentication but than I have to find it’s related group in firestore which is nested in one of the many user groups. So by iterating all of the groups and all of their users can be very expensive. It’s OK with a few groups and users but it’s easy to admit that it’s not scalable.

One of my idea to reduce the number of reads is to create a separate collection to manage the group and their users relations. This collection would contain all of the groups with their id’s with a map field which would contain all of the related user ids. But than if a user gets created, or deleted it must be written in the currently mentioned document and also in the other document where it’s related data is stored. So with a solution like this reads can be much less because it equals with the number of groups not the number of users. On the other hand the id’s are duplicated which also means duplicate writes but I guess it is a reasonable trade-off.

So is there a better way to do this, or this solution would be good enough for maintainability and scalability?

real analysis – Band limited initial data : Regularity for Navier Stokes Equation defined on a Torus $mathbb{T}^m$

Consider the Navier stokes equation and the Euler equation defined on a Torus(periodic solutions).
Let the dimensionality of the space $mathbb{T}^m$ be $mge 3$.

Link to the Problem.

Has it been investigated partially or conclusively, the regularity of the solutions when the initial data $u_0(x) = u(x,0)$ is a trigonometric polynomial of a certain degree?

References to any closely related research is also appreciated.

factory reset – my mobile data is not working after i reseted my sumsung galaxy note 3

Reset network setting again. Manually enter APN setting. For that
Go to setting / connection / mobile network / Access point name. Manually enter apn details.

Turn off data saver. Go to setting / connection / data usage / data saver.
Make sure you have good network signal. Other wise reinsert sim.

Update mobile software.

Make sure data roaming is off. setting /connections mobile network / data roaming.

Temporary remove from network and again reconnect to network.