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)
#tricks#basic
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#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
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#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
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INVEST $1000 GET $15,000
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#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
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#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
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FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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INVEST $1000 GET $15,000
INVEST $2000 GET $30,000
INVEST $3000 GET $45,000
INVEST $4000 GET $60,000
INVEST $5000 GET $75,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
INVEST $50,000 GET $800,000
FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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INVEST $1000 GET $15,000
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#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
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INVEST $1000 GET $15,000
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INVEST $5000 GET $75,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
INVEST $50,000 GET $800,000
FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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TRADING INVESTMENT PLAN
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#5DAYS PLAN👇👇
PROMO PLAN
INVEST $1000 GET $15,000
INVEST $2000 GET $30,000
INVEST $3000 GET $45,000
INVEST $4000 GET $60,000
INVEST $5000 GET $75,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
INVEST $50,000 GET $800,000
FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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TRADING INVESTMENT PLAN
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#5DAYS PLAN👇👇
PROMO PLAN
INVEST $1000 GET $15,000
INVEST $2000 GET $30,000
INVEST $3000 GET $45,000
INVEST $4000 GET $60,000
INVEST $5000 GET $75,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
INVEST $50,000 GET $800,000
FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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TRADING INVESTMENT PLAN
If you know you have $1000 and above this is your opportunity to make it big in our Investment plan. Offer closing soon
#5DAYS PLAN👇👇
PROMO PLAN
INVEST $1000 GET $15,000
INVEST $2000 GET $30,000
INVEST $3000 GET $45,000
INVEST $4000 GET $60,000
INVEST $5000 GET $75,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $150,000
INVEST $20,000 GET $300,000
INVEST $50,000 GET $800,000
FOR INTERESTED INVESTORS SEND ME YOUR FULL NAME, CONTACT NUMBER, NATIONALITY , EMAIL ADDRESS AND BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
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