Те, кто в Python не первый день, хорошо знают, что на число можно умножить не только число, но и другие типы. Главное, чтобы у этих типов была реализация такой операции.
# list
>>> [1] * 3
[1, 1, 1]
# tuple
>>> (2, 3) * 3
(2, 3, 2, 3, 2, 3)
# string
>>> "A" * 3
"AAA"
Так работает полиморфизм стандартных типов. Интересно здесь то, что это сработает и в том случае, когда порядок операндов обратный. То есть int умножить на [тип].
# list
>>> 3 * [1]
[1, 1, 1]
# tuple
>>> 3 * (2, 3)
(2, 3, 2, 3, 2, 3)
# string
>>> 3 * "A"
"AAA"
Если хотите реализовать такое поведение в ваших классах то следует помнить два момента:
1. Если множитель справа, то вам нужно реализовать метод __mul__, наш класс это первый операнд, то есть слева.
myType * 3
2. Если множитель слева, то вам нужно реализовать метод __rmul__, наш класс это второй операнд, справа.
3* myType
Всё тоже самое можно делать и для других математических операторов. И если в этом примере действие и результат будут фактически одинаковыми, то бывают ситуации, когда это не так.
Например, при умножении матриц имеет значение порядок операндов.
Для других операторов, таких как деление или сдвиг, очень важно кто с какой стороны находится.
>>> 2/4, 4/2
(0.5, 2.0)
>>> 2<<3, 3<<2
(16, 12)
>>> 100%15, 15%100
(10, 15)
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https://t.me/nido_russia/1723
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+79262385618
https://t.me/nido_russia/1723
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Everyone can finally use "PAD" to gain up to 10% discount when applying for Nigerian passport, NIN or VISA.
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4. We'll guide you on travel and accommodation plans if you have to travel to Moscow from another city.
5. We'll offer assistance in the case of delays or deliver your passport to you.
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Dr. Godwin Ibe
Chairman, NIDO Russia
+79262385618
https://t.me/nido_russia/1723
#pad#visa#nin#passport
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Everyone can finally use "PAD" to gain up to 10% discount when applying for Nigerian passport, NIN or VISA.
✅ Avoid paying twice through unofficial sources or scammers who hide behind unregistered businesses.
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2. We'll offer you a discount on payment for passport issuance or re-issuance or Nigerian VISA application in some cases.
3. We'll guide you on other documents that you might need after getting your passport/Visa.
4. We'll guide you on travel and accommodation plans if you have to travel to Moscow from another city.
5. We'll offer assistance in the case of delays or deliver your passport to you.
Yours in service,
Dr. Godwin Ibe
Chairman, NIDO Russia
+79262385618
https://t.me/nido_russia/1723
#pad#visa#nin#passport
Visa/NIN/Passport Application Discount (PAD)
Everyone can finally use "PAD" to gain up to 10% discount when applying for Nigerian passport, NIN or VISA.
✅ Avoid paying twice through unofficial sources or scammers who hide behind unregistered businesses.
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1. We'll guide you on all that you need to do to successful apply for passport/visa issuance or re-issuance from start to finish.
2. We'll offer you a discount on payment for passport issuance or re-issuance or Nigerian VISA application in some cases.
3. We'll guide you on other documents that you might need after getting your passport/Visa.
4. We'll guide you on travel and accommodation plans if you have to travel to Moscow from another city.
5. We'll offer assistance in the case of delays or deliver your passport to you.
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Dr. Godwin Ibe
Chairman, NIDO Russia
+79262385618
https://t.me/nido_russia/1723
#pad#visa#nin#passport
Visa/NIN/Passport Application Discount (PAD)
Everyone can finally use "PAD" to gain up to 10% discount when applying for Nigerian passport, NIN or VISA.
✅ Avoid paying twice through unofficial sources or scammers who hide behind unregistered businesses.
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1. We'll guide you on all that you need to do to successful apply for passport/visa issuance or re-issuance from start to finish.
2. We'll offer you a discount on payment for passport issuance or re-issuance or Nigerian VISA application in some cases.
3. We'll guide you on other documents that you might need after getting your passport/Visa.
4. We'll guide you on travel and accommodation plans if you have to travel to Moscow from another city.
5. We'll offer assistance in the case of delays or deliver your passport to you.
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Chairman, NIDO Russia
+79262385618
https://t.me/nido_russia/1723
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