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🖥 Ленивые импорты в Python — lazy import

🟡Все import'ы, по умолчанию, выполняются во время загрузки скриптов. Это не всегда хорошо: представим себе CLI-утилиту с 2 командами:

$ ./utility.py --help
./utility.py usage:

* --help        Shows this message
* hard_work     Does all the work

$ ./utility.py hard_work
Importing the universe...
Looking for stars*...
Done!

1 команда показывает документацию, 2 — делает что-то полезное. Если для одной из команды требуются некие импорты (возможно тяжёлые), они будут выполняться для всех команд, даже если они там не нужны. Это сказывается на времени запуска скрипта.

🟡Посмотреть, какие импорты выполняются при запуске скрипта можно с помощью встроенного профайлера:
$ PYTHONPROFILEIMPORTTIME=1 ./utility.py --help
import time: self [us] | cumulative | imported package
import time:      1000 |       1000 | the_universe
import time:      2000 |       2000 | stars
...

Для чтения таких файликов рекомендую использовать tuna, визуализатор профайлов:
$ PYTHONPROFILEIMPORTTIME=1 ./utility.py --help 2> import.log
$ tuna import.log


🟡Что делать с такими импортами, которые нужны не всегда? Использовать ленивые импорты!

▶️ Подробнее про ленивые импорты

@pythonl

Python/ django
🖥 Ленивые импорты в Python — lazy import

🟡Все import'ы, по умолчанию, выполняются во время загрузки скриптов. Это не всегда хорошо: представим себе CLI-утилиту с 2 командами:
$ ./utility.py --help
./utility.py usage:

* --help        Shows this message
* hard_work     Does all the work

$ ./utility.py hard_work
Importing the universe...
Looking for stars*...
Done!

1 команда показывает документацию, 2 — делает что-то полезное. Если для одной из команды требуются некие импорты (возможно тяжёлые), они будут выполняться для всех команд, даже если они там не нужны. Это сказывается на времени запуска скрипта.

🟡Посмотреть, какие импорты выполняются при запуске скрипта можно с помощью встроенного профайлера:
$ PYTHONPROFILEIMPORTTIME=1 ./utility.py --help
import time: self [us] | cumulative | imported package
import time:      1000 |       1000 | the_universe
import time:      2000 |       2000 | stars
...

Для чтения таких файликов рекомендую использовать tuna, визуализатор профайлов:
$ PYTHONPROFILEIMPORTTIME=1 ./utility.py --help 2> import.log
$ tuna import.log


🟡Что делать с такими импортами, которые нужны не всегда? Использовать ленивые импорты!

▶️ Подробнее про ленивые импорты

@pythonl
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The easiest way to hide texts from view in Telegram without deleting them is to achieve them, although the process requires a few extra steps to complete. Follow the instructions below to do so on both mobile and PC. Open the Telegram mobile app (Android | iOS) and locate the convo you wish to archive, but don’t tap on it. Long-press it until you see a green checkmark appear next to the contact’s profile picture. A few buttons will show up in the upper-right corner as well. Select the “Archive” icon.On PC, you’ll need to right-click on the conversation on the right side of the display and select the “Archive” option.

🖥 Ленивые импорты в Python — lazy import

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