buffering

Fix CLI buffering in Python with:

$ python -u foo.py | tee mylog.log

"-u" means unbuffered, or something

Virtual Environments

# Check Python version
python3 --version

# Check pip version
pip3 --version

# Install virtualenv
pip3 install virtualenv

# Install venv
sudo apt install python3-venv

# Navigate to your project directory
cd ~/my_project/

# Create virtual environment
python3 -m venv myenv

# Activate virtual environment
source myenv/bin/activate

# Now you can install packages
pip install <your-package>

# Deactivate when you're done
deactivate

What Libs Have I?

$ pip freeze --local
blinker==1.6.2
click==8.1.7
flask==2.3.3
importlib-metadata==6.8.0
itsdangerous==2.1.2
Jinja2==3.1.2
MarkupSafe==2.1.3
werkzeug==2.3.7
zipp==3.16.2

Package Info

• https://pypi.org/project/package-name/
  • eg: https://pypi.org/project/itsdangerous/

Datetime and Timestamp

When including time, use one of the following:
pytz.utc.localize(datetime.utcfromtimestamp(ts)) = 1970-01-01 00:00:00+00:00
datetime.fromtimestamp(ts, timezone.utc) = 1970-01-01 00:00:00+00:00
int(dt_with_tz.timestamp()) = 0

now_dt = pytz.utc.localize(datetime.utcnow()) = 2023-09-24 00:01:12.141804+00:00
now_ts = int(now_dt.timestamp()) = 1695513672
now_dt = datetime.fromtimestamp(now_ts, timezone.utc) = 2023-09-24 00:01:12+00:00
now_ts = int(pytz.utc.localize(datetime.utcnow()).timestamp()) = 1695513672