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PrimroseUvicorn & Gunicorn
Uvicorn and GunicornUvicorn and Gunicorn are important concepts when developing applications in Python. However, there are many concepts to be aware of in order to fully understand Uvicorn and Gunicorn. The following is a brief summary of the necessary concepts, and the details will be dealt with separately later.Necessary ConceptsStarletteStarlette is a Web application server that can run asynchronously. Starlette runs on top of Uvicorn.FastAPIFastAPI provides many features on top of Starlet...
PrimroseGas optimization in Solidity, Ethereum
I’m sorry but my English is terrible. I hope you understand that generously.Recently, I was developing a toy project named Blind Market. It’s a simple P2P trading application using smart contract. I was making a contract using Solidity, and the trade stage proceeded in the order of pending, shipping, and done. The problem was appeared in done phase. The problem was that when I tried to close the transaction by paying the price raised by the seller in msg.value, the following error occurred.Pe...
PrimroseP2WPKH
P2WPKHP2WPKH란 비트코인 내에서 가장 일반적인 스크립트 형식으로 비트코인 프로토콜에 대한 지불 거래 유형이다. 주소는 1로 시작하는데, 세그윗을 지원하는 새로운 주소 3 또는 bc1로 시작하는 주소보다 훨씬 비싸다. https://mirror.xyz/0xA1d9f681B25C14C1eE7B87f1CF102E73cA3ad4d9/egjhNVklgy_LgZmcTXXAOTBa6ePBqO3Ja9ZSoDIad-8 즉, 비트코인 주소가 1로 시작하면 P2PKH 주소를 사용하고 있는 것이다. 공개키의 간단한 해시이며, 이 해시를 주소로 사용하는 것이다. 이것은 원래 비트코인 주소 형식이었으며 오늘까지도 충실히 작동한다. 레거시 주소는 세그윗과 호환되지 않지만, 여전히 문제없이 P2PKH 주소에서 세그윗 주소로 BTC를 보낼 수 있다. 그러나 레거시 주소 트랜잭션이 더 크기 때문에 P2PKH 주소에서 전송하는 평균 속도는 세그윗 주소에서 전송할 때보다 더 높은 요금이 발생할 수 있다....
<100 subscribers
PrimroseUvicorn & Gunicorn
Uvicorn and GunicornUvicorn and Gunicorn are important concepts when developing applications in Python. However, there are many concepts to be aware of in order to fully understand Uvicorn and Gunicorn. The following is a brief summary of the necessary concepts, and the details will be dealt with separately later.Necessary ConceptsStarletteStarlette is a Web application server that can run asynchronously. Starlette runs on top of Uvicorn.FastAPIFastAPI provides many features on top of Starlet...
PrimroseGas optimization in Solidity, Ethereum
I’m sorry but my English is terrible. I hope you understand that generously.Recently, I was developing a toy project named Blind Market. It’s a simple P2P trading application using smart contract. I was making a contract using Solidity, and the trade stage proceeded in the order of pending, shipping, and done. The problem was appeared in done phase. The problem was that when I tried to close the transaction by paying the price raised by the seller in msg.value, the following error occurred.Pe...
PrimroseP2WPKH
P2WPKHP2WPKH란 비트코인 내에서 가장 일반적인 스크립트 형식으로 비트코인 프로토콜에 대한 지불 거래 유형이다. 주소는 1로 시작하는데, 세그윗을 지원하는 새로운 주소 3 또는 bc1로 시작하는 주소보다 훨씬 비싸다. https://mirror.xyz/0xA1d9f681B25C14C1eE7B87f1CF102E73cA3ad4d9/egjhNVklgy_LgZmcTXXAOTBa6ePBqO3Ja9ZSoDIad-8 즉, 비트코인 주소가 1로 시작하면 P2PKH 주소를 사용하고 있는 것이다. 공개키의 간단한 해시이며, 이 해시를 주소로 사용하는 것이다. 이것은 원래 비트코인 주소 형식이었으며 오늘까지도 충실히 작동한다. 레거시 주소는 세그윗과 호환되지 않지만, 여전히 문제없이 P2PKH 주소에서 세그윗 주소로 BTC를 보낼 수 있다. 그러나 레거시 주소 트랜잭션이 더 크기 때문에 P2PKH 주소에서 전송하는 평균 속도는 세그윗 주소에서 전송할 때보다 더 높은 요금이 발생할 수 있다....
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Let’s know about generic programming, and also why we should use it.
Static polymorphism supports the concept of generic programming.
The definition of generalized programming is not generally agreed. (As if there is no definition of object-oriented programs that everyone accepts )
But we can understand generic programming by comparing simple examples.
Let’s see add function below.
func add(a, b int) int {
return a + b
}
Since Golang is a strong type language, an error will occur if you insert a non-int type parameter as shown in the example below.
func main() {
result := add(0.25, 0.75)
fmt.Println(result)
}
As such, making functions separately for each type, such as int8, int16, float64, is a very cumbersome task.
And if the function behavior changes, the maintenance is not good because you have to change all the functions.
Generic programming allows you to address this issue as follows:
func addT constraints.Integer | contraints.Float T {
return a + b
}
Generic functions are functions that operate on different types through type parameters, such as the add() function discussed earlier.
// Define Function name(Primrose) and type parameter(T constraint)
func PrimroseT contraint {
...
}
Generic functions are defined as above.
Write down the func function keyword and then the function name.
Then open the brackets and write down the type parameters.
The type parameter is the parameter name, and in the figure above, T is the parameter name.
Then write down the type limit. You can write multiple type parameters as needed.
Then close the brackets, open the brackets, and write inputs and outputs like a normal function.
The type parameter name used for the type parameter can be used instead of a specific type.
func PrintT ant {
fmt.Println(a, b)
}
func main() {
// OK
Print(1, 2)
Print(3.14, 1.43)
Print("Hello", "World")
// Error !
Print(1, "Hello")
}
func PrintT1 any, T2 any {
fmt.Println(a, b)
}
func PrintInterface(a, b interface{}) {
fmt.Println(a, b)
}
func main() {
// ... Two function will get same result.
}
func addT Integer T {
return a + b
}
type Integer interface {
~ int8 | ~int16 | ~int32 | ~int64 | ~int
}
func addT Integer T {
return a + b
}
type MyInt int
func main() {
// OK!
add(1, 2)
var a MyInt = 3
var b MyInt = 5
add(a, b)
}
Let’s know about generic programming, and also why we should use it.
Static polymorphism supports the concept of generic programming.
The definition of generalized programming is not generally agreed. (As if there is no definition of object-oriented programs that everyone accepts )
But we can understand generic programming by comparing simple examples.
Let’s see add function below.
func add(a, b int) int {
return a + b
}
Since Golang is a strong type language, an error will occur if you insert a non-int type parameter as shown in the example below.
func main() {
result := add(0.25, 0.75)
fmt.Println(result)
}
As such, making functions separately for each type, such as int8, int16, float64, is a very cumbersome task.
And if the function behavior changes, the maintenance is not good because you have to change all the functions.
Generic programming allows you to address this issue as follows:
func addT constraints.Integer | contraints.Float T {
return a + b
}
Generic functions are functions that operate on different types through type parameters, such as the add() function discussed earlier.
// Define Function name(Primrose) and type parameter(T constraint)
func PrimroseT contraint {
...
}
Generic functions are defined as above.
Write down the func function keyword and then the function name.
Then open the brackets and write down the type parameters.
The type parameter is the parameter name, and in the figure above, T is the parameter name.
Then write down the type limit. You can write multiple type parameters as needed.
Then close the brackets, open the brackets, and write inputs and outputs like a normal function.
The type parameter name used for the type parameter can be used instead of a specific type.
func PrintT ant {
fmt.Println(a, b)
}
func main() {
// OK
Print(1, 2)
Print(3.14, 1.43)
Print("Hello", "World")
// Error !
Print(1, "Hello")
}
func PrintT1 any, T2 any {
fmt.Println(a, b)
}
func PrintInterface(a, b interface{}) {
fmt.Println(a, b)
}
func main() {
// ... Two function will get same result.
}
func addT Integer T {
return a + b
}
type Integer interface {
~ int8 | ~int16 | ~int32 | ~int64 | ~int
}
func addT Integer T {
return a + b
}
type MyInt int
func main() {
// OK!
add(1, 2)
var a MyInt = 3
var b MyInt = 5
add(a, b)
}
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