ubuntu 16.04 tip

参考

1. 安装 python3.6 

sudo add-apt-repository ppa:jonathonf/python-3.6 

sudo apt-get update

sudo apt-get install python3.6 

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2

   Finally switch between the two python versions for python3 via command:

sudo update-alternatives --config python3

python3 -V

  bug, gnome-terminal won’t launch after step 3, a workaround is running following commands to recreate the symlink:

sudo rm /usr/bin/python3

sudo ln -s python3.5 /usr/bin/python3

 2. pip3.6安装regex失败 pip3 install regex 

   $ sudo apt-get install python3.6-dev libpython3.6-dev

3.  install mongodb on ubuntu-16.04

4. install pymongo and tutorial （runoob）

    org doc

整库备份

    # mysql> create database miantiao

# mysql> use your_database_name;
# mysql> source file.sql;

import and export

Export:

mysqldump -u username –-password=your_password database_name > file.sql

Import:

mysql -u username –-password=your_password database_name < file.sql 

Another way to import dump files when source <filename> doesn't work is to do the following:

Dump

~> mysqldump --user=<user> --password=<password> <db_name> > <export_file_name>.sql

Import

> mysql -u <user> -p <pass> <db_name>
mysql> USE <db_name>;  (if you didn't already select)
mysql> \. ~/<export_file_name>.sql

    mysql doc

5. 更换python版本后出现 No module named "apt_pkg"

First: 

How to Fix Error sudo: add-apt-repository: command not found

Then:

Error sudo: add-apt-repository: command not found [duplicate]

6. douyin 爬虫

7. mongodb 按时间大小 搜索

REF:

mogondb 简易手册

markdown简易语法（图文并茂）

Markdown链接及脚注

Reloading modules in Python    

For >=Python3.4

import importlib
importlib.reload(module)

UnicodeEncodeError

编辑~/.bash_profile文件（'~'指的是用户登录后的默认目录），添加一行：export LANG="en_US.UTF-8"

在运行python命令前添加参数 PYTHONIOENCODING=utf-8 python printcn.py

How can I set VIM's default encoding to UTF-8?

In your .vimrc, add set encoding=utf-8 and restart Vim.