Python

List comprehension

if/else

lista = [f(x) if condition else g(x) for cosa in cosas]

Solo if

lista = [f(x) for cosa in cosas if condition]

Breakpoint con saltos de linea

pip install ipython

En el breakpoint poner:

(pdb) from IPython import embed; embed()

Conversiones de fechas

Parsear str a datetime

from datetime import datetime

datetime_str = "2021-01-01 00:00:00"
datetime_obj = datetime.strptime(start_date, "%Y-%m-%d %H:%M:%S")

Datetime obj a string

obj_datetime = datetime(2021, 1, 1, 0, 0)
str_datetime = obj_datetime.strftime("%Y-%m-%d %H:%M:%S")

Timezones y esas cosas

Convertir a timezone, le dices que timezone es y lo conviertes:

date = date(2021, 3, 9)

# ahora le pones la hora (00:00 de ese día)
date_time = datetime.combine(date, datetime.min.time())  # last_date a 00:00:00, tambien se puede hacer directo el datetime

# le especificas y lo conviertes
target_time_zone = pytz.timezone("Europe/Madrid")
date_time.replace(tzinfo=pytz.utc).astimezone(target_time_zone).strftime('%d-%m-%Y %H') # con el dia y la hora

Tambien:

date_interest = date(2021, 3, 28)

# Date previous (7 days)
date_interest_previous = date_interest - timedelta(days=7)

local_tz = pytz.timezone("Europe/Madrid")

# From y to de la actual
date_interest_time_init = datetime.combine(date_interest, datetime.min.time())  # last_date a 00:00:00
date_interest_time_to = (
    local_tz.localize(date_interest_time_init.replace(hour=hour)).astimezone(pytz.utc).replace(tzinfo=None)
)

# From y to de la previous
date_interest_time_init_previous = datetime.combine(date_interest_previous, datetime.min.time())  # prev a 00:00:00
date_interest_time_to_previous = (
    local_tz.localize(date_interest_time_init_previous.replace(hour=hour)).astimezone(pytz.utc).replace(tzinfo=None)
)

Entornos virtuales

python3 -m venv path/to/newenv

Might need to give execute permission: chmod +x myenv/bin/activate

source myenv/bin/activate

Using VirtualenvWrapper

Todo esto en el entorno base!

Instalar virtualenv

pip install virtualenv

Add to path the virtualenv to path: add to .profile the path venv was installed:

export PATH=$PATH:/home/javi/.local/bin

Instalar virtualenvwrapper

pip install virtualenvwrapper

Añadir al .bashrc

export WORKON_HOME=$HOME/.virtualenvs

# find / -name virtualenvwrapper.sh
export VIRTUALENVWRAPPER_SCRIPT=/home/javi/.local/bin/virtualenvwrapper.sh 
export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
source /home/javi/.local/bin/virtualenvwrapper.sh

Binary ops

Number 4 in binary with all trailing 0s

format(4, "06b")

'000100'