0 Raspberry Pi is set in the root directory of the SD card to expand to the entire

Command line interface to enter commands into the Raspberry Pi configuration interface. Using the arrow keys and left and right cursor key switch position.

In other source

sudo nano /etc/apt/sources.list

In the beginning of the first line plus one #after the next copy the contents of the last row, as shown in the results:

deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi

Press on the keyboard ctrl+ o, press Enter to save, press ctrl+ xto exit nano editor back to the command line interface. Then enter the following command to update to the latest software mirroring Tsinghua list.

sudo apt-get update

To pip change source

sudo mkdir ~/.pip
ls .pip
sudo nano pip.conf

Enter the following in the open file:

[global]
timeout = 10
index-url =  http://mirrors.aliyun.com/pypi/simple/
extra-index-url= http://pypi.douban.com/simple/
[install]
trusted-host=
    mirrors.aliyun.com
    pypi.douban.com

Press on the keyboard ctrl+ o, press Enter to save, press ctrl+ xto exit nano editor back to the command line interface.

2 opening function ssh pin serial port spi etc.

Raspberry Pi internal settings

Command line interface to enter commands into the Raspberry Pi configuration interface. Using the arrow keys and left and right cursor key switch position.

sudo raspi-config

Interfacing Options

Open the Camera, SSH, VNC, Serial, Remote GPIO

Advanced Options

Select Expand Filesystem, will be extended to the root directory of the SD card, make full use of the SD memory card. Without this step, subsequent commands will be stuck. Exit setup interface, restart the raspberry pie.

3 Chinese Typing hair

Install Chinese fonts

sudo apt-get install fonts-wqy-zenhei

Fcitx installed Chinese input method and Google Pinyin input method (takes about five minutes)

sudo apt-get install Fcitx Fcitx googlepinyin Fcitx-module-Cloudpinyin Fcitx Sunpinyin

After installation, you can restart. ctrl + Chinese input method is switched to the space

4 to replace python2.7 3.7

Raspberry Pi comes python2 and 3 versions, to use the words of 3, had to specifically knock python3, pip3 so a series of instructions

But python2 we basically have not learned

So delete python2.7, enter:

sudo apt-get autoremove python2.7

After unloading, we found python3 want to use the time, I had to knock python3

Want to knock out directly python3 python, then the first link python deleted:

sudo rm /usr/bin/python

　Upload a new link:

sudo ln -s /usr/bin/python3.7 /usr/bin/python

　　View Version:

python

　　It is shown below:

Python 3.7.3 (default, Apr 3 2019, 05:39:12) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

Raspberry Pi 4 (1) a key arrangement