kandi X-RAY | pq Summary
kandi X-RAY | pq Summary
Pure Go Postgres driver for database/sql
Top functions reviewed by kandi - BETA
pq Key Features
pq Examples and Code Snippets
def __init__(self, graph, start_vertex): self._pq = MinPQ() self._marked = defaultdict(bool) self._mst = Queue() self.visit(graph, start_vertex) while not self._pq.is_empty(): edge = self._pq.del_mi
def __init__(self, size: int) -> None: """Max priority queue initialization. Args: size (int): priority queue size """ self._pq = [MIN_VAL] * (size + 1) self._size = 0 self._min = None
Trending Discussions on pq
I receive a daily export of data every day I load into my excel sheet via Power Query. The table of data I can't control is:
tblExportName Company States Jane Doe ABC AK,AL,GA,WA John Smith ACME AK,GA,FL,WA
I need to replace those State Abbreviations with a technology string of information for this question I'll use "Full State Name" as a substitute. So basically it checks the COMPANY field against another table as the "technology Strings" will be different for each Company per State.
So far so good, or so I thought. Then I split delimiters of tblExport.States BY "," which then I getName Company States.1 States.2 States.3 States.4 Jane Doe ABC AK AL GA WA John Smith ACME AK GA FL WA
Now we reference that table that contains the Company, State, FullStateNames
tblStateNamesCOMPANY Abbr State Name ABC AL AlabamaABC ABC AK AlaskaABC ACME AK AlaskaACME ACME GA GeorgiaACME ABC FL FloridaABC ABC WA WashingtonABC ACME WA WashingtonACME ...
ANSWERAnswered 2022-Mar-20 at 15:55
If I understand, here is one way to do it:
- Read in the two tables
- split the Export table state abbreviations into ROWS
- Join with the StateName Table
- Group by Name and Company
- Extract a delimited list of the state names from each subtable
- Expand that list
Please read the code comments and explore the Applied Steps to better understand what is going on
I'm trying to simply insert the following into the postgres database by using Go's pq library (I'm following Let's Go book, but using Postgres instead of mySQL):...
ANSWERAnswered 2022-Mar-07 at 08:47
You may multiply
interval '1 day' by a bound parameter, to achieve the correct interval you want.
I am trying to retrieve some municipalities from Wikidata using SPARQL but several items returned have much of their fields empty despite these items having these data. I do not understand what is wrong with the query below (link to WQS). For example, the municipality Almelo has its coordinates (
P625), and parent place (
P131) erroneously missing in the results:
ANSWERAnswered 2022-Feb-11 at 11:10
You have to declare
OPTIONAL each statement independently:
I am just getting started learning docker a few hours ago and I trying to make my own docker image. When I tried to make a Dockerfile and a docker image, I got this error message "/bin/sh: 1: source: not found".
First of all, I manage my environment variables in .env file. Whenever I change my env file, I run this command $source .env and go build . and then go run main.go. So, I tried to set up my Dockerfile, RUN source.env but I got the error that I mentioned above.
- RUN . setting.env & . setting but didn't work
- change the file name into setting.env and then RUN . ./setting.env & . ./setting & ["/bin/bash", "-c", "source ~/.setting.env"] also didn't work...
I really appreciate your help!
ANSWERAnswered 2022-Mar-01 at 06:47
It seems like .env file is not contained in your image.
Try to execute source .env after copying .env file into the image.
I know Python best, so I would like to use Python, but it is not a strict requirement.Problem
I need to move Parquet files from one location (a URL) to another (an Azure storage account, in this case using the Azure machine learning platform, but this is irrelevant to my problem).
These files are too large to simply perform
pd.read_parquet("https://my-file-location.parquet"), since this reads the whole thing into an object.
I thought that there must be a simple way to create a file object and stream that object line by line -- or maybe column chunk by column chunk. Something like...
ANSWERAnswered 2021-Aug-24 at 06:21
This is possible but takes a little bit of work because in addition to being columnar Parquet also requires a schema.
The rough workflow is:
Open a parquet file for reading.
Then use iter_batches to read back chunks of rows incrementally (you can also pass specific columns you want to read from the file to save IO/CPU).
Close the files.
Parquet requires random access, so it can't be streamed easily from a URI (pyarrow should support it if you opened the file via HTTP FSSpec) but I think you might get blocked on writes.
I am failing to implement a numba jitted priority queue.
Heavily plagiarized from the python docs, I am fairly happy with this class....
ANSWERAnswered 2021-Sep-15 at 10:48
This was not possible due to several issues in numba, but should be fixed for the next release (0.55) if I understood correctly. As a workaround for now, I could get it working by compiling llvmlite 0.38.0dev0 and the master branch of numba. I do not use conda but it is apparently easier to get pre-releases of llvmlite and numba this way.
Here is my implementation:
The code is compiled, and run without any issue in CLion IDE with g++ compiler in MinGW, however, the same exact code has a compilation error in Visual Studio IDE and with (MSVC compiler)
I believe the error should have to do with the follwoing comparator class:...
ANSWERAnswered 2022-Feb-03 at 21:36
Your somewhat odd comparator...
I designed a circular queue program which provides queue management system. Everything works fine, except that in some cases, I can't print the queue.
ANSWERAnswered 2021-Dec-22 at 10:29
Following your suggestion, let's see what happens when we insert 4 customers, then remove 2, then insert 2 more:
TL (see TL;DR near the end of the question)
I came about this data with pipes as field delimiters (
|) and backslash-quote pairs as quotes (
\") to fields with delimiters in the data, such as:
ANSWERAnswered 2021-Dec-21 at 13:40
You seem to be trying to use
[^\\\"] to mean
not the string \" but it doesn't mean that, it means
neither the char \ nor the char ". You need to have a single char to negate in that part of the
FPAT regexp so the approach is to convert every
\" in the input to a single char that can't be present in the input (I use
\n below as that's usually
RS but you can use any char that can't be in the record), then split the record into fields, and then restore the
\"s before using each individual field:
- I have a pandas DataFrame:
ANSWERAnswered 2021-Dec-11 at 12:02
I think you need give
ParquetDataset a hint of the partition keys schema.
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