owen800q

function bytes sequence signature

arm 32

2D E9 F0 4F A3 B0 81 46 50 20 10 70 D9 F8 98 70 00 2F

arm 64

FF 03 05 D1 FC 6B 0F A9 F9 63 10 A9 F7 5B 11 A9 F5 53 12 A9 F3 7B 13 A9 08 0A 80 52 48 00 00 39 16 54 40 F9 56 07 00 B4 C8 02 40 F9 08 07 00 B4 29 20 40 A9 F3 03 02 AA

owen800q

Async Await Best Practices Cheat Sheet

Summary of Asynchronous Programming Guidelines

Name	Description	Exceptions
Avoid async void	Prefer async Task methods over async void methods	Event handlers
Async all the way	Don't mix blocking and async code	Console main method
Configure context	Use ConfigureAwait(false) when you can	Methods that require con­text

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Show Nth commit logs from the beginning

Example, Show first 4 commit histroies from first inital commit

it log  --pretty=oneline | tail -n 4

Output

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

owen800q

 uwsgi --socket 0.0.0.0:5000 --plugin python --protocol=http --wsgi-file wsgi.py 
open("/usr/lib/uwsgi/plugins/python_plugin.so"): No such file or directory [core/utils.c line 3691]
!!! UNABLE to load uWSGI plugin: /usr/lib/uwsgi/plugins/python_plugin.so: cannot open shared object file: No such file or directory !!!
uwsgi: unrecognized option '--wsgi-file'
getopt_long() error

Solution:

owen800q

Method 1:

Using socket, build go as a server. From python, pass parameter over socket connection and get results from go server.

Method 2:

Compile Go to shared object library, call from python with ctypes

sample code

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Init...
CheckCPU: SSE2 support: yes
Checking setup...
Launching TeamViewer ...
Launching TeamViewer GUI ...

then the windows does not pop out

Solution:

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# Convert nested model object to dict

def my_dict(obj):
    if not  hasattr(obj,"__dict__"):
        return obj
    result = {}
    for key, val in obj.__dict__.items():
        if key.startswith("_") and key == 'metadata':
            continue
        element = []

owen800q

Here I use the cert issued by charles proxy as example

openssl x509 -inform PEM -subject_hash_old -in ~/.charlesproxy/charles.pem | head -1

returned hash code -> 38fd165b

cat ~/.charlesproxy/charles.pem > 38fd165b.0 

owen800q

## Model classes


class Book(Base):
    __tablename__ = 'books'
    id = Column(Integer,primary_key = True)
    book_id = Column(Integer,unique = True)
    title = Column(String, nullable = False)
    author = Column(String,index = True)
    created_date = Column(DateTime,server_default = func.now())