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deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

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#!/usr/bin/python
import ftplib

def upload_1():
    session = ftplib.FTP('example.com','username','password')
    file = open('cup.mp4','rb')                     # file to send
    session.storbinary('STOR '+'cup.mp4', file)     # send the file
    file.close()                                    # close file and FTP
    session.quit()

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# 数据库驱动
jdbc.driver=org.sqlite.JDBC

# 数据库文件位置(数据库文件为little.db，位于类路径下)
jdbc.url=jdbc:sqlite::resource:little.db

# 用户名(默认root)
jdbc.username=root

# 密码(默认root)

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JavaScript Crypto Libraries

I start with a list and plan to create a comparison table.

WebCryptoAPI

http://www.w3.org/TR/WebCryptoAPI/

This specification describes a JavaScript API for performing basic cryptographic operations in web applications, such as hashing, signature generation and verification, and encryption and decryption. Additionally, it describes an API for applications to generate and/or manage the keying material necessary to perform these operations. Uses for this API range from user or service authentication, document or code signing, and the confidentiality and integrity of communications.

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/* 引用样式 */
blockquote {
    background: #f9f9f9;
    border-left: 10px solid #ccc;
    margin: 1.5em 10px;
    padding: .5em 10px;
    quotes: "\201C""\201D""\2018""\2019";
}

blockquote:before {

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arr = [3, 8, 4, 2, 6, 7, 9, 1, 5]

length = len(arr)
i = 1 #[1, length - 1] 表示第几趟遍历
j = 0 #[0, length - 1 - i] 表示某一趟遍历中，待比较的两个数中前一个数的位置

while i < length:
    j = 0
    while j < length - i:
        if arr[j] > arr[j + 1]:

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# encoding: UTF-8
import _thread as thread, time
import threading

# 一个用于在线程中执行的函数
def func():
    for i in range(5):
        print('func')
        time.sleep(1)

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#coding:utf-8
import requests
import json
import os.path

def create_gist(file_path, name = None, desc = '', public = True):
    TOKEN = '[your token]'
    URL = 'https://api.github.com/gists'
    headers = {'Authorization': 'token {0}'.format(TOKEN)}

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# 使用iter函数
with open('a.txt', 'r') as file:
    for l in iter(file.readline, ''):
        print(l)

# file对象是iterable
with open('a.txt', 'r') as file:
    for l in file:
        print(l)

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def fibonacci():
    a = b = 1
    yield a
    yield b
    while True:
        a, b = b, a + b
        yield b