TGTGInsighttelegram intelligenceLIVE / telegram public index
← Python Заметки

TGINSIGHT SIMILAR POSTS

Најди сличен содржај

Изворен канал @pythonotes · Post #411 · 9 фев.

reload_flag="" if [[ -n "${DEBUG}" ]]; then reload_flag="--reload" fi if [[ -n "${WORKER_COUNT}" ]]; then workers=${WORKER_COUNT} else workers=2 fi gunicorn --workers ${workers} \ --bind 0.0.0.0:8000 \ ${reload_flag} main.wsgi Писали такие конструкции чтобы проверить наличие флага и сформировать команду правильно? На самом деле можно сделать тоже самое проще. Для этого используются операторы условной подстановки, доступные в оболочках семейства POSIX. :- для установки значений по умолчанию ${WORKER_COUNT:-2} Если переменная не объявлена, то будет дефолтное значение 2. :+ подставляет указанный текст, если переменная не пуста ${DEBUG:+--reload} Если что-то есть в переменной то распечатается текст после символа +, в противном случае - ничего. Удобно для опциональных флагов, как в нашем примере. Итого наш скрипт может выглядеть так: gunicorn --workers ${WORKER_COUNT:-2} \ --bind 0.0.0.0:8000 \ ${DEBUG:+--reload} main.wsgi Есть еще два оператора. := не только подставить дефолтное значение, но и присвоить его переменной, если она пуста # никаких переменных еще нет VAL1=${VAL2:=hello} # теперь доступны обе echo $VAL1 $VAL2 # hello hello :? остановить выполнение с ошибкой, если переменной нет. echo ${MISS:?is required} bash: MISS: is required Код выхода будет 1. #tricks#linux

Резултати

Пронајдени 9 слични објави

Пребарај: #architecturedesign

当前筛选 #architecturedesign清除筛选

Business Center in Fukuoka, Japan. OMA/Shohei Shigematsu's Tenjin Business Center in Fukuoka, Japan articulates the convergence of urban activity. By eroding the façade, the building carves out an entry plaza at the ground level and green terraces along the upper level offices. #architecture#building#archdaily #architecturedesign#arch_shovel

The winning proposal for Dock A at the internationally acclaimed Zurich airport. The new Dock is comprised of solid local wood and answers the increasing complexity of our airports with the simplest possible response: a mass timber space frame that is structural design, spatial experience, architectural finish, and organizational principle in one. Architecture: big, Hok Network, 10:8 architects, buro happold, timber experts Pirmin Jung and aviation consultant NACO. Visualization: Bucharest.studio #architecture#building#archdaily#architecturedesign#arch_shovel

The Panda Pavilions. Architect: EID Architecture. Location: Chengdu, China Area: 12,287 m2 Construction nearly completed,and pavilions will open to public in 2022. . #iarchitectures#superarchitects#archdaily#architecture#architecturedrawing#archisource#architecturedesign#allofarchitecture#sketchbook#architecturalsketch#architecturesketch#arch_shovel

Wettingen railway station area. Architecture: Schneider & Schneider Architects Visual by OVI images . #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#arch_shovel_architecture

Red Bull Headquarters in Leipzig, Germany. . Visualization by Sora Architecture: 3XN Architects . #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#arch_shovel_architecture

Proposal for the new National Design Museum in Sejong. . Architecture: STLarchitects . #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#arch_shovel_architecture

Grand Tower. Architecture by Werner Sobek. #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#arch_shovel_architecture

Water Tower. Architecture: Snohetta Visualization:TMRW . #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#arch_shovel_architecture

The circular form of World of Volvo. Architecture by Henning Larsen. Visualization by Kvant.1 and Henning Larsen . #iarchitectures#superarchitects#flatdesign#architectural#archdaily#architecture#architecturedrawing#archi_students#showitbetter#archisource#archdraw#architecturedesign#arch_shovel#henninglarsen