zhangzhiqiangcs’s gists

zhangzhiqiangcs / ubuntu升级python

Created June 21, 2016 00:52

	wget https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz
	tar -xvJf Python-3.5.1.tar.xz
	.configure
	make
	make install
	python
	此时已经安装python 3.5.1，但是在命令行中输入python的时候还是原来的版本

	另一个比较好的解决方法是使用pythonbrew工具
	$ python -V

zhangzhiqiangcs / 平日笔记

Last active March 13, 2017 07:23

存放平时查阅资料需要记录下来的东西

	网络字节顺序是TCP/IP中规定好的一种数据表示格式，它与具体的CPU类型、操作系统等无关，从而可以保证数据在不同主机之间传输时能够被正确解释。网络字节顺序采用big endian排序方式。

	为了进行转换 bsd socket提供了转换的函数有下面四个
	htons 把unsigned short类型从主机序转换到网络序
	htonl 把unsigned long类型从主机序转换到网络序
	ntohs 把unsigned short类型从网络序转换到主机序
	ntohl 把unsigned long类型从网络序转换到主机序

	在使用little endian的系统中这些函数会把字节序进行转换
	在使用big endian类型的系统中这些函数会定义成空宏

zhangzhiqiangcs / valuable blogs

Created March 16, 2017 02:41

http://eli.thegreenplace.net/

zhangzhiqiangcs / wait to be shared

Created March 16, 2017 02:41

	http://www.infoq.com/cn/articles/c-language-2016

zhangzhiqiangcs / sum_of_a_and_b_not_+_-

Created July 22, 2017 05:07

	int getSum(int a, int b) {
	int sum = a;
	while (b != 0)
	{
	sum = a ^ b;//calculate sum of a and b without thinking the carry
	b = (a & b) << 1;//calculate the carry
	a = sum;//add sum(without carry) and carry
	}
	return sum;
	}

zhangzhiqiangcs / PS1

Created August 8, 2017 06:13

ubuntu 命令行提示符配置

	export PS1="\u@\h:# "

zhangzhiqiangcs / 升级JDK

Last active August 8, 2017 08:00

JDK版本从1.7升级到1.8

	# Ubuntu
	# add-apt-repository: command not found
	# 查看Ubuntu版本
	cat /etc/issue
	# For Ubuntu 14.04 or 16.04 you need another package:
	apt-get install software-properties-common
	# If you are using an older release of Ubuntu, ie before 12.10, it is necessary to install the package python-software-properties
	sudo apt-get install python-software-properties

	add-apt-repository ppa:webupd8team/java

zhangzhiqiangcs / useful site

Created August 10, 2017 01:33

	# Unofficial Windows Binaries for Python Extension Packages
	http://www.lfd.uci.edu/~gohlke/pythonlibs

zhangzhiqiangcs / zzu

Created August 22, 2017 10:15

zzu远程教育刷题

	__author__ = 'zhangzhiqiang'

	import requests
	import re
	from collections import defaultdict
	from pprint import pprint
	from urllib.parse import quote, urlencode, urlparse, urlunparse
	from bs4 import BeautifulSoup as bs

	login_url = "http://vls3.zzu.edu.cn/vls2s/zzjlogin.dll/login"

zhangzhiqiangcs / resolution.txt

Created October 19, 2018 07:04

apt-get update fails to fetch files, “Temporary failure resolving …” error

	First, temporarily add a known DNS server to your system.
	echo "nameserver 8.8.8.8" \| tee /etc/resolv.conf > /dev/null
	Then run sudo apt-get update.

	If this fixes your temporary resolving messages then either wait for 24 hours to see if your ISP fixes the issue for you
	(or just contact your ISP) - or you can permanently add a DNS server to your system:
	echo "nameserver 8.8.8.8" \| sudo tee /etc/resolvconf/resolv.conf.d/base > /dev/null

	8.8.8.8 is Google's own DNS server