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
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#GSTRateChange From 1 Jan 2024, you should see price displays from GST-registered businesses, with GST charged at 9%. Prices that are quoted, whether written or verbal, should be GST-inclusive so that you know the final price pay upfront.
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#GSTRateChange With the second step of the GST rate change approaching, IRAS reminds all businesses to ensure that their systems are ready to incorporate the new 9% GST rate with effect from 1 Jan 2024 and to take active steps to avoid rate change errors during implementation.
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#GSTRateChange Businesses are strongly encouraged to start preparation early for a smooth transition to the GST rate of 9% on 1 Jan 2024. Here are 3 main things for businesses to do, ahead of the second GST rate change.
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#GSTRateChange PSA: Only GST-registered businesses can charge GST from their effective date of GST registration. You can check if a business is GST-registered at https://go.gov.sg/gst-registered-business-search.
Non-GST registered businesses are not allowed to charge GST.
#GSTRateChange Do you know how much GST will be charged, for transactions that span the rate change? It all depends on when the invoice is issued, whether payment is made and if the goods/services have been delivered/performed. Read on for some scenarios you might find yourself in!
👉🏼Click here for more info on the transitional rules for the rate change
#GSTRateChange Heading to the 24-hour store to grab some post-NYE party essentials in the wee hours of 1 Jan 2024? #DidYouKnow that you may only be charged GST at 8% on your purchase, if it is the supplier’s normal accounting practice to treat sales made after midnight as sales of the preceding day!
👉🏼Click here for more info on the transitional rules for the rate change
#GSTRateChange Making a run to the 24-hour store in the wee hours of 1 Jan?#DidYouKnow you may only be charged GST at 7% on your purchase, if it is the supplier’s normal accounting practice to treat sales made after midnight as sales of the preceding day!
👉🏼 Click here for more info on the transitional rules for the rate change
Navigate the right GST rate to pay for transactions spanning the rate change with new mummy and her bestie! 💁♀️💡
A transaction is considered to span the GST rate change if one or two of the following events takes place wholly or partially on/after 1 Jan 2024:
- The issuance of invoice by supplier
- The receipt of payment by supplier
- The delivery of goods or performance of services
More info at go.gov.sg/irasgst-rc-consumers
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Here are 3 key things GST-registered businesses need to prepare for the 2024 GST rate change:
1) Update systems to incorporate 9% GST from 1 Jan 2024
2) Prepare price displays to reflect 9% GST from 1 Jan 2024
3) Understand transitional rules to apply the correct GST rate for transactions spanning 1 Jan 2024
Learn more at go.gov.sg/irasgst-rc-businesses
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