Python and rust 2018 pythonkorea jihun

Aug 2, 20180 likes72 views

The document discusses Python and Rust programming languages. It provides examples of basic programming concepts in Rust like variables, data types, functions, iterators, and match expressions. It also discusses ownership and borrowing in Rust. Additionally, it covers proof of work algorithms and benchmarking code for mining cryptocurrency blocks.

Hello world
fn main() { 
println!("Hello, world!");
 
}

Variable and mutability
fn main() {
let x = 5; 
println!("The value of x is: {}", x);
}

fn main() { 
 
let x = 5;
println!("The value of x is: {}", x);
x = 6;
println!("The value of x is: {}", x);
}

OOPS!
error[E0384]: cannot assign twice to immutable variable
`x`
--> src/main.rs:6:5
|
2 | let x = 5;
| - first assignment to `x`
...
6 | x = 6;
| ^^^^^ cannot assign twice to immutable variable

fn main() {
let mut x = 5;
println!("The value of x is: {}", x);
x = 6;
println!("The value of x is: {}", x);
}
The value of x is: 5 
The value of x is: 6

Data type
Length Signed Unsigned
8-bit i8 u8
16-bit i16 u16
32-bit i32 u32
64-bit i64 u64
arch isize usize
Number literals Example
Decimal 98_222
Hex 0xff
Octal 0o77
Binary 0b1111_0000
Byte (u8 only) b'A'

$fn main() { let x = 2.0; // f64 let y: f32 = 3.0; // f32 let z = 2; // i32 let dc: i32 = 93_222; // i32 let t = true; let f: bool = false; }$

Ownership
fn main() {
let s1 = String::from("hello");
}

Ownership
fn main() {
let s1 = String::from("hello");
let s2 = s1;
}

Ownership
fn main() {
let s1 = String::from("hello");
let s2 = s1;
println!("{}", s1);
}

Slice
fn main() {
let s = String::from("hello world");
let hello = &s[0..5];
let world = &s[6..11];
}

fn main() {
let s = String::from("hello world");
let hello = &s[0..5];
let world = &s[6..11];
}

fn main() {
let s = String::from("hello");
let len = s.len();
let slice = &s[3..len];
let slice = &s[3..];
}

Iterators
fn main() {
for x in 0..10 {
println!("{}", x); // x: i32
}
}

Iterators
fn main() {
let arr = [1, 2, 3, 4, 5];
for v in arr.iter() {
println!("{}", v);
}
}

$Match fn main() { let x = 5; match x { 1 => println!("one"), 2 => println!("two"), 3 => println!("three"), 4 => println!("four"), 5 => println!("five"), _ => println!("something else"), } }$

$function fn main() { print_number(5); } fn print_number(x: i32) { println!("x is: {}", x); }$

$function fn main() { let add = add_one(5); println!("{}", add); } fn add_one(x: i32) -> i32 { x + 1 } 결과: 6$

Cargo
• 패키지 매니저

• 코드 빌드

• 다운로드 및 의존성 관리

• 다운로드한 패키지를 작성한 코드와 함께 빌드

• 각종 커맨드 제공 (test 등등 . .)

Pure python and
proof of work
algorithm
순수 파이선 그리고 증명 알고리즘

block.nonce = 0
computed_hash = block.compute_hash()
while not computed_hash.startswith('0' *BlockChain.difficulty):
block.nonce += 1
computed_hash = block.compute_hash()
print(computed_hash, block.nonce)
return computed_hash
Proof of work

“0” * 6
“000000”
difficulty
sha256을 했을때 앞에 “000000” 이 나와야합니다.
난이도에 따라서, 많은 컴퓨팅 파워를 필요하게 됩니다.

00000005efd98a9ed95f36a568632fa73a58912f33ddda23d41205ca8b2bf44c
Difficulty = 7
00e23adbc0a8c69c24b0f8382ba088733a21415bd3053d7cecb31a99a0779db2
Difficulty = 2
0ae23adbc0a8c69c24b0f8382ba088733a21415bd3053d7cecb31a99a0779db2
Difficulty = 1
0000000000000005efd98a9ed951f36a506863=1f33ddda23d41205ca8b2bf44c
Difficulty =15

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この資料は、Roy FieldingのREST論文（第5章）を振り返り、現代Webで誤解されがちなRESTの本質を解説しています。特に、ハイパーメディア制御やアプリケーション状態の管理に関する重要なポイントをわかりやすく紹介しています。 This presentation revisits Chapter 5 of Roy Fielding's PhD dissertation on REST, clarifying concepts that are often misunderstood in modern web design—such as hypermedia controls within representations and the role of hypermedia in managing application state.

Modeling the Influence of Environmental Factors on Concrete Evaporation RateJournal of Soft Computing in Civil Engineering

Newly poured concrete opposing hot and windy conditions is considerably susceptible to plastic shrinkage cracking. Crack-free concrete structures are essential in ensuring high level of durability and functionality as cracks allow harmful instances or water to penetrate in the concrete resulting in structural damages, e.g. reinforcement corrosion or pressure application on the crack sides due to water freezing effect. Among other factors influencing plastic shrinkage, an important one is the concrete surface humidity evaporation rate. The evaporation rate is currently calculated in practice by using a quite complex Nomograph, a process rather tedious, time consuming and prone to inaccuracies. In response to such limitations, three analytical models for estimating the evaporation rate are developed and evaluated in this paper on the basis of the ACI 305R-10 Nomograph for “Hot Weather Concreting”. In this direction, several methods and techniques are employed including curve fitting via Genetic Algorithm optimization and Artificial Neural Networks techniques. The models are developed and tested upon datasets from two different countries and compared to the results of a previous similar study. The outcomes of this study indicate that such models can effectively re-develop the Nomograph output and estimate the concrete evaporation rate with high accuracy compared to typical curve-fitting statistical models or models from the literature. Among the proposed methods, the optimization via Genetic Algorithms, individually applied at each estimation process step, provides the best fitting result.

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Modeling the Influence of Environmental Factors on Concrete Evaporation RateJournal of Soft Computing in Civil Engineering

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Python and rust 2018 pythonkorea jihun

1. Python and Rust 파이썬 그리고 러스트 Jihun

2. • 아직 배울 점이 많은 개발자 입니다.

4. DIVE INTO DIVERSITY 다양성에 빠지다

6. Introduce Rust 러스트 소개

8. Hello world fn main() {  println!("Hello, world!");   }

9. Variable and mutability fn main() { let x = 5;  println!("The value of x is: {}", x); }

10. fn main() {    let x = 5; println!("The value of x is: {}", x); x = 6; println!("The value of x is: {}", x); }

12. fn main() { let mut x = 5; println!("The value of x is: {}", x); x = 6; println!("The value of x is: {}", x); } The value of x is: 5  The value of x is: 6

13. Data type Length Signed Unsigned 8-bit i8 u8 16-bit i16 u16 32-bit i32 u32 64-bit i64 u64 arch isize usize Number literals Example Decimal 98_222 Hex 0xff Octal 0o77 Binary 0b1111_0000 Byte (u8 only) b'A'

14. fn main() { let x = 2.0; // f64 let y: f32 = 3.0; // f32 let z = 2; // i32 let dc: i32 = 93_222; // i32 let t = true; let f: bool = false; }

15. Ownership fn main() { let s1 = String::from("hello"); }

16. Ownership fn main() { let s1 = String::from("hello"); let s2 = s1; }

17. Ownership fn main() { let s1 = String::from("hello"); let s2 = s1; println!("{}", s1); }

18. OOPS!

19. Slice fn main() { let s = String::from("hello world"); let hello = &s[0..5]; let world = &s[6..11]; }

20. fn main() { let s = String::from("hello world"); let hello = &s[0..5]; let world = &s[6..11]; }

21. fn main() { let s = String::from("hello"); let len = s.len(); let slice = &s[3..len]; let slice = &s[3..]; }

22. Iterators fn main() { for x in 0..10 { println!("{}", x); // x: i32 } }

23. Iterators fn main() { let arr = [1, 2, 3, 4, 5]; for v in arr.iter() { println!("{}", v); } }

24. Match fn main() { let x = 5; match x { 1 => println!("one"), 2 => println!("two"), 3 => println!("three"), 4 => println!("four"), 5 => println!("five"), _ => println!("something else"), } }

25. function fn main() { print_number(5); } fn print_number(x: i32) { println!("x is: {}", x); }

26. function fn main() { let add = add_one(5); println!("{}", add); } fn add_one(x: i32) -> i32 { x + 1 } 결과: 6

27. Cargo • 패키지 매니저 • 코드 빌드 • 다운로드 및 의존성 관리 • 다운로드한 패키지를 작성한 코드와 함께 빌드 • 각종 커맨드 제공 (test 등등 . .)

29. Pure python and proof of work algorithm 순수 파이선 그리고 증명 알고리즘

30. block.nonce = 0 computed_hash = block.compute_hash() while not computed_hash.startswith('0' *BlockChain.difficulty): block.nonce += 1 computed_hash = block.compute_hash() print(computed_hash, block.nonce) return computed_hash Proof of work

31. “0” * 6 “000000” difficulty sha256을 했을때 앞에 “000000” 이 나와야합니다. 난이도에 따라서, 많은 컴퓨팅 파워를 필요하게 됩니다.

32. 00000005efd98a9ed95f36a568632fa73a58912f33ddda23d41205ca8b2bf44c Difficulty = 7 00e23adbc0a8c69c24b0f8382ba088733a21415bd3053d7cecb31a99a0779db2 Difficulty = 2 0ae23adbc0a8c69c24b0f8382ba088733a21415bd3053d7cecb31a99a0779db2 Difficulty = 1 0000000000000005efd98a9ed951f36a506863=1f33ddda23d41205ca8b2bf44c Difficulty =15

33. block.nonce = 0 computed_hash = block.compute_hash() while not computed_hash.startswith('0' *BlockChain.difficulty): block.nonce += 1 computed_hash = block.compute_hash() print(computed_hash, block.nonce) return computed_hash Proof of work

35. Problem 문제점

37. Let’s benchmark

39. Q / A

Python and rust 2018 pythonkorea jihun

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