diffrent ad-hoc tasks in python

python_tips.py

# pickle save and load
import pickle
pickle.dump(obj, open(file, 'wb'))
obj = pickle.load(open(file, 'rb'))

# datetime tasks
import datetime
datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')

# get execution time
import time
def getDuration(start_time, end_time):
    d = round(end_time - start_time)
    h = d // (60 * 60)
    m = d // 60 % 60
    s = d % 60
    msg = ''
    if h > 0: msg += str(h) + ' hours '
    if m > 0: msg += str(m) + ' minutes '
    msg += str(s) + ' seconds'
    return msg

start_time = time.time()
time.sleep(5)
getDuration(start_time, time.time())

# virtual environments
python3 -m venv /d/python_envs/pymupdf
source /d/python_envs/pymupdf/Scripts/activate
deactivate
# run directly
/d/python_envs/pymupdf/bin/python file.py
/d/python_envs/pymupdf/bin/pip install -r requirements.txt