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import fcntl
import time

start = time.monotonic()

with open("/gpfs/lock/mylock", "w") as f:
    while True:
        try:
            fcntl.flock(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
            break

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Producer 側

def enqueue(payload: bytes, logical_hash: str, priority: int) -> int:
    """
    BEGIN IMMEDIATE;
    INSERT INTO requests (...);
    COMMIT;
    return request_id
    """

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from dataclasses import fields, MISSING
import logging

logger = logging.getLogger(__name__)


def from_dict(cls, data: dict):
    field_map = {field.name: field for field in fields(cls)}

    extra_keys = data.keys() - field_map.keys()

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import sqlite3
import socket
from dataclasses import dataclass
from typing import Optional, Callable


# ----------------------------------------------------------------------
# Data model
# ----------------------------------------------------------------------

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Specify the USB device

lsblk

Mount the device

sudo mkdir -p /mnt/usb
sudo mount /dev/sdb1 /mnt/usb

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import React, { useState, useEffect } from 'react';
import axios from 'axios';

const HelloComponent = () => {
  const [helloMessage, setHelloMessage] = useState('Loading...');

  useEffect(() => {
    const fetchData = async () => {
      try {
        const graphqlQuery = {

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Name:       example-package
Version:    1.0
Release:    1%{?dist}
Summary:    An example RPM package
License:    GPL
URL:        http://www.example.com
Source0:    example.txt

BuildArch:  noarch

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sudo yum install rpm-build python3-devel
pip install setuptools_rust

PyPi package の download

• https://pypi.org/project/ansible/2.9.27/#files
  • https://files.pythonhosted.org/packages/5b/99/ce005d0314840e1a6eef34e0faf0ba4f7bccd8172b33cc84fee21afab7ad/ansible-2.9.27.tar.gz

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How to upload/download pdf to Kindle Cloud

Note: This article is only for amazon.co.jp.

How to upload a book

Upload your pdf via Send to Kindle (https://www.amazon.co.jp/sendtokindle) app.

How to remove a book

Remove an item listed in personal documents.

[optional] How to compress pdf files

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FROM node:14

RUN apt-get update \
 && npm install -g @google/clasp -g \
 
WORKDIR /workdir
VOLUME /workdir 

SHELL ["/bin/bash", "-c"]