If you:

• Noticed anything wrong with the notes
• Want to recommend any new points
• Or other complaints or advice

Then Shoot it out! @Astatine-Tian and @JohnLiu will fix it ASAP!

Link back to the notes:

Chapter 1: Information Representation
Chapter 2: Communication and Information Technology
Chapter 3: Hardware
[Chapter 4]
Chapter 5: Processor Fundamentals
[Chapter 6]
Chapter 7: System Software
Chapter 8: Security
Chapter 9: Ethics and Ownership
Chapter 10: Database

We do sincerely appreciate your feedback!

If you have noticed any problems with the notes, please post it below!

We will look at it as soon as possible.

Thanks, John.

When you download external packages, you would usually use the following commands in terminal:
pip3 download <package>, e.g. pip3 download wxpython
However default pip3 download source is from overseas. This leads to a very slow download speed -- 20kb/s for me. It took me half a day just to download the OpenCV4!

Solution:

Switch to a nearby server mirror. I can download packages at 2MbPS now!

Shown below, the solution from https://www.jianshu.com/p/e993bdfff7b3 is clear. Thanks!

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

Fell free to comment below if you encountered any quesitions.

PPC错误重现
@Astatine-Tian

1. After compiling, the program can be executed
2. Compress and decompress. Execute new file.
3. Warning: "Cannot open the file because unable to verify security."
4. Manually click open. Can normally open.
5. Select level. Cannot pull down subjects.

Tried re-compile entire program. Retried steps 1-2.
No warning shown in step 3. Can successfully execute.
Cannot re-produce error anymore.

PHP是世界上最好的语言！（