Ранее я делал серию постов про битовые операторы.
Вот вам ещё один наглядный пример как это используется в Python в модуле re.
Чтобы указать флаг для компилятора нам надо указать его после передаваемой строки. Например, добавляем флаг для игнорирования переноса строки.
pattern = re.compile(r"(\w+)+")
words = pattern.search(text, re.DOTALL)
А как указать несколько флагов? Ведь явно будут ситуации когда нам потребуется больше одного. Кто читал посты по битовые операторы уже понял как.
pattern.search(text, re.DOTALL | re.VERBOSE)
А теперь смотрим исходники, что находится в этих атрибутах?
Не удивительно, степени двойки. Почему? Потому что каждое следующее значение это сдвиг единицы влево.
>>> for n in [1, 2, 4, 8, 16, 32, 64, 128, 256]:
>>>
print(bin(n))
0b1
0b10
0b100
0b1000
0b10000
0b100000
0b1000000
0b10000000
0b100000000
Чтобы было понятней, давайте напишем тоже самое но иначе, добавим ведущие нули:
000000001
000000010
000000100
000001000
000010000
000100000
001000000
010000000
100000000
Не понятно что тут происходит? Читай три поста про битовые операторы начиная с этого ➡️https://t.me/pythonotes/45
В общем, это пример применения побитовых операций в самом Python.
Теперь вы знаете Python еще немного лучше)
#tricks#regex#libs
Fashion doesn’t have to cost the earth! This International Day of Zero Waste puts the spotlight on fashion and textiles. Here’s how we can do our part to reduce textile waste:
✅ 𝗥𝗘𝗨𝗦𝗘 worn-out clothes for other purposes e.g. pillow covers, cleaning rags
✅ 𝗥𝗘𝗗𝗨𝗖𝗘 impulse purchases by checking if you already have something similar
✅ 𝗗𝗢𝗡𝗔𝗧𝗘 outgrown clothing
#TowardsZeroWaste
It’s the International Day of Zero Waste! If you’ve yet to embark on the journey #TowardsZeroWaste, here’s your sign to get started: go.gov.sg/towards-zero-waste
It’s World Tuna Day! If you have leftover canned tuna (or any other canned fish), be sure to store it properly in a sealed container. This extends the lifespan of your leftovers and minimises food waste!
#TowardsZeroWaste
It’s the first International Day of Zero Waste, and a good opportunity to take stock of how far we’ve come in our journey #TowardsZeroWaste.
If you’ve yet to get started on this journey, now’s the time! Tips at www.nea.gov.sg/our-services/towards-zero-waste
Spring cleaning and getting rid of unwanted items, such as clothes or household items? If they are still in good condition, consider donating them!
Discover what you can do with items that you no longer need here: go.gov.sg/nea-donate
#TowardsZeroWaste
Have you recycled your used PMD yet? From now until June 2021, you’ll be able to do so at collection points in residential areas. Check out where and when at https://www.kgs.com.sg/pmd-collection-program
Aside from retrieving precious materials from its li-ion batteries, the metal parts can also be used in the manufacturing of other products. #TowardsZeroWaste
Not sure what to do with your used Personal Mobility Device (PMD)? Recycle it! Aside from retrieving precious materials from its li-ion batteries, the metal parts can also be used in the manufacturing of other products.
To make recycling PMDs more convenient, we are collaborating with KGS Pte Ltd to set up collection points at residential areas until June 2021. Check out where and when at https://www.kgs.com.sg/pmd-collection-program#TowardsZeroWaste
Our actions today impact our world tomorrow, and it is up to us to make it a better one. Together, let’s work #TowardsZeroWaste and build a #SustainableSG.
If you’re still not sure how to start, check out the activities and challenges at www.gogreen.gov.sg/programmes/
By reducing waste and recycling right, we help protect our environment and extend landfill capacity.
Let’s safeguard, nurture, and cherish our environment for future generations. 🌱
#SayYESToWasteLess#TowardsZeroWaste
As the festive clock ticks, let's not forget the ticking dates in our pantry!
Place items nearing their expiry dates at the front of your shelves. This helps you remember to use them soon and reduce food wastage.
#SayYEStoWasteLess#TowardsZeroWaste
This holiday season, let's embrace moderation over mountains of food!
Avoid waste! Choose portions that are just right and delight in every bite. 😋
#SayYEStoWasteLess#TowardsZeroWaste
Have leftover items from your Lunar New Year festivities?
Be sure to place food that is near expiry within view, and practise the “First to Expire, First Out” approach when organising your home pantry!
#SayYEStoWasteLess#TowardsZeroWaste