pq | Simple transactional queue for PostgreSQL written in Python | Database library

by malthe Python Version: 1.9.1 License: No License

X-Ray Key Features Code Snippets(2)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | pq Summary

pq is a Python library typically used in Database, PostgresSQL applications. pq has no bugs, it has no vulnerabilities, it has build file available and it has high support. You can install using 'pip install pq' or download it from GitHub, PyPI.

Simple transactional queue for PostgreSQL written in Python

Support

Quality

Security

License

Reuse

Support

pq has a highly active ecosystem.

It has 338 star(s) with 41 fork(s). There are 14 watchers for this library.

It had no major release in the last 12 months.

There are 17 open issues and 13 have been closed. On average issues are closed in 69 days. There are 3 open pull requests and 0 closed requests.

It has a negative sentiment in the developer community.

The latest version of pq is 1.9.1

Quality

pq has 0 bugs and 0 code smells.

Security

pq has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

pq code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

pq does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

pq releases are not available. You will need to build from source code and install.

Deployable package is available in PyPI.

Build file is available. You can build the component from source.

pq saves you 780 person hours of effort in developing the same functionality from scratch.

It has 1813 lines of code, 114 functions and 23 files.

It has high code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed pq and discovered the below as its top functions. This is intended to give you an instant insight into pq implemented functionality, and help decide if they suit your requirements.

Return the next item in the queue
Pull a single row from the cursor
Get the next job from the queue
A context manager for a transaction
A context manager that returns a connection
Wait for a given timeout
Listen for events
Get the next item
Decorator to define a prepared statement
Generate a unique identifier

Get all kandi verified functions for this library.

pq Key Features

No Key Features are available at this moment for pq.

pq Examples and Code Snippets

Initialize the minimum PQ .

python

Lines of Code : 16

License : No License

Copy

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

Initialize pq .

python

Lines of Code : 9

License : No License

Copy

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

Community Discussions

Trending Discussions on pq

Conditional Columns and Delimited Fields

Go postgres prepared statement with interval parameter not working

Missing data fields in Wikidata Query Service results despite items having these data

How to solve /bin/sh: 1: source: not found during making docker image in MacOS(Golang)?

Read / Write Parquet files without reading into memory (using Python)

How can I implement a numba jitted priority queue?

How to fix an error associating with a comparator?

How to display an entire queue struct

GNU awk, FPAT and matching negative string regex with regex and special chars

Schema for pyarrow.ParquetDataset > partition columns

QUESTION

Conditional Columns and Delimited Fields

Asked 2022-Mar-20 at 15:55

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:

tblExport

Name 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 get

Name 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

tblStateNames

COMPANY Abbr State Name ABC AL AlabamaABC ABC AK AlaskaABC ACME AK AlaskaACME ACME GA GeorgiaACME ABC FL FloridaABC ABC WA WashingtonABC ACME WA WashingtonACME ...

ANSWER

Answered 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

Source https://stackoverflow.com/questions/71547873

QUESTION

Go postgres prepared statement with interval parameter not working

Asked 2022-Mar-07 at 08:52

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):

...

ANSWER

Answered 2022-Mar-07 at 08:47

You may multiply interval '1 day' by a bound parameter, to achieve the correct interval you want.

Source https://stackoverflow.com/questions/71378392

QUESTION

Missing data fields in Wikidata Query Service results despite items having these data

Asked 2022-Mar-05 at 12:10

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:

...

ANSWER

Answered 2022-Feb-11 at 11:10

You have to declare OPTIONAL each statement independently:

Source https://stackoverflow.com/questions/71078547

QUESTION

How to solve /bin/sh: 1: source: not found during making docker image in MacOS(Golang)?

Asked 2022-Mar-01 at 06:47

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.

I tried

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!

Edit 1]

...

ANSWER

Answered 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.

Source https://stackoverflow.com/questions/71284065

QUESTION

Read / Write Parquet files without reading into memory (using Python)

Asked 2022-Feb-28 at 11:12

I looked at the standard documentation that I would expect to capture my need (Apache Arrow and Pandas), and I could not seem to figure it out.

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.

Expectation

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

...

ANSWER

Answered 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).
You can then transform each pa.RecordBatch from iter_batches further. Once you are done transforming the first batch you can get its schema and create a new ParquetWriter.
For each transformed batch call write_table. You have to first convert it to a pa.Table.
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.

Source https://stackoverflow.com/questions/68819790

QUESTION

How can I implement a numba jitted priority queue?

Asked 2022-Feb-07 at 04:31

I am failing to implement a numba jitted priority queue.

Heavily plagiarized from the python docs, I am fairly happy with this class.

...

ANSWER

Answered 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:

Source https://stackoverflow.com/questions/68585821

QUESTION

How to fix an error associating with a comparator?

Asked 2022-Feb-03 at 21:36

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:

...

ANSWER

Answered 2022-Feb-03 at 21:36

Your somewhat odd comparator...

Source https://stackoverflow.com/questions/70978400

QUESTION

How to display an entire queue struct

Asked 2021-Dec-22 at 10:29

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.

My code:

...

ANSWER

Answered 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:

Initially:

Source https://stackoverflow.com/questions/70445851

QUESTION

GNU awk, FPAT and matching negative string regex with regex and special chars

Asked 2021-Dec-21 at 16:55

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:

...

ANSWER

Answered 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:

Source https://stackoverflow.com/questions/70435473

QUESTION

Schema for pyarrow.ParquetDataset > partition columns

Asked 2021-Dec-11 at 20:37

I have a pandas DataFrame:

...

ANSWER

Answered 2021-Dec-11 at 12:02

I think you need give ParquetDataset a hint of the partition keys schema.

Source https://stackoverflow.com/questions/70308728

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install pq

You can install using 'pip install pq' or download it from GitHub, PyPI.
You can use pq like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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