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package main

import (
	"database/sql"
	"fmt"
	"net/url"
	"os"
	"reflect"
	"regexp"
	"strconv"

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https://press.one/p/v?s=3e847f723e47d6ac7bd089898e402e9b70d2e0637e32d1f8d0ff16afd41b1dd30c3964f1f013cc1e974b5e53daf21b0129a4aaeca650ae6699a7c4c9ea73f6f11&h=8b054f0565fab31acda1800144c83566a9d692fc369ee166d93853838faa285b&a=ecc6419a875c0bd57743cb0602f46e3e28185ec2&f=P1&v=3

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Cryptographic Best Practices

Putting cryptographic primitives together is a lot like putting a jigsaw puzzle together, where all the pieces are cut exactly the same way, but there is only one correct solution. Thankfully, there are some projects out there that are working hard to make sure developers are getting it right.

The following advice comes from years of research from leading security researchers, developers, and cryptographers. This Gist was [forked from Thomas Ptacek's Gist][1] to be more readable. Additions have been added from

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def hexlify(msg)
	msg.split("").collect { |c| c[0].to_s(16) }.join
end
def unhexlify(msg)
	msg.scan(/../).collect { |c| c.to_i(16).chr }.join
end

puts hexlify("Hello World")

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/**
 * Retrieves all the rows in the active spreadsheet that contain data and logs the
 * values for each row.
 * For more information on using the Spreadsheet API, see
 * https://developers.google.com/apps-script/service_spreadsheet
 */
function readRows() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var rows = sheet.getDataRange();
  var numRows = rows.getNumRows();

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modifier isHuman() {
        address _addr = msg.sender;
        uint256 _codeLength;

        assembly {_codeLength := extcodesize(_addr)}
        require(_codeLength == 0, "sorry humans only");
        _;
    }

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Python Socket 编程详细介绍

Python 提供了两个基本的 socket 模块：

• Socket 它提供了标准的BSD Socket API。
• SocketServer 它提供了服务器重心，可以简化网络服务器的开发。

下面讲解下 Socket模块功能。

Socket 类型

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package main

import (
	"bytes"
	"compress/gzip"
	"database/sql/driver"
	"errors"
	"fmt"
	"github.com/jmoiron/sqlx"
	_ "github.com/mattn/go-sqlite3"

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package main

import (
	"database/sql"
	"errors"
	"fmt"
	_ "github.com/bmizerany/pq"
	"os"
	"regexp"
	"strings"

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package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/rlp"
	"github.com/syndtr/goleveldb/leveldb"
)