01 10 100
In Python 2 you can do:
print "%02d" % (1,)
Basically % is like printf or sprintf.
For Python 3.+ the same behavior can be achieved with:
print("{:02d}".format(1))
For Python 3.6+ the same behavior can be achieved with f-strings:
print(f"{1:02d}")
References
https://stackoverflow.com/questions/134934/display-number-with-leading-zeros
You can use the chdir flag for Gunicorn to change to the project directory before executing your command.
gunicorn -w 2 -b 0.0.0.0:8000 --chdir /home/telessaude/telessaude_branch_master telessaude.wsgi_dev:application --reload --timeout 900
References
https://pypi.org/project/python-snap7/
https://python-snap7.readthedocs.io/en/latest/installation.html
https://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html
https://simplyautomationized.blogspot.com/2016/02/python-snap7-s7-1200-simple-example.html
https://simplyautomationized.blogspot.com/2016/02/raspberry-pi-python-snap7-data-blocks.html
source myvenv/bin/activate python myapp.py deactivate
References
https://pypi.org/project/venv-run/
https://stackoverflow.com/questions/52586471/run-python-script-using-only-the-virtual-environment-folder
pip install gunicorn
gunicorn -w 4 -b 0.0.0.0:14002 app:app
References
http://flask.pocoo.org/docs/1.0/deploying/wsgi-standalone/
https://pypi.org/project/gunicorn/
import sys
from gevent import server
from gevent.baseserver import _tcp_listener
from gevent import pywsgi
from gevent.monkey import patch_all; patch_all()
from multiprocessing import Process, current_process, cpu_count
def hello_world(env, start_response):
if env['PATH_INFO'] == '/':
start_response('200 OK', [('Content-Type', 'text/html')])
return ["<b>hello world</b>"]
else:
start_response('404 Not Found', [('Content-Type', 'text/html')])
return ['<h1>Not Found</h1>']
listener = _tcp_listener(('127.0.0.1', 8001))
def serve_forever(listener):
pywsgi.WSGIServer(listener, hello_world).serve_forever()
number_of_processes = 5
print 'Starting %s processes' % number_of_processes
for i in range(number_of_processes):
Process(target=serve_forever, args=(listener,)).start()
serve_forever(listener)
References
https://stackoverflow.com/questions/7407868/gevent-pywsgi-server-multiprocessing
Additional options
--host=127.0.0.2 --port=1234
import os print "This process has the PID", os.getpid()
import pkg_resources
from subprocess import call
call("venv\Scripts\python.exe -m pip install --upgrade pip", shell=True)
packages = [dist.project_name for dist in pkg_resources.working_set]
call("venv\Scripts\python.exe -m pip install --upgrade " + ' '.join(packages), shell=True)
References
https://stackoverflow.com/questions/2720014/upgrading-all-packages-with-pip
import cv2
import numpy as np
is_drawing = False
ix = -1
iy = -1
blank_image = np.zeros([512, 512, 3], dtype=np.uint8)
def draw_rectangle(event, x, y, flags, param):
global is_drawing, ix, iy
if event == cv2.EVENT_LBUTTONDOWN:
is_drawing = True
ix = x
iy = y
elif event == cv2.EVENT_LBUTTONUP:
is_drawing = False
cv2.rectangle(img=blank_image, pt1=(ix, iy), pt2=(x, y), color=(255, 0, 0), thickness=-1)
ix = -1
iy = -1
elif event == cv2.EVENT_MOUSEMOVE:
if is_drawing:
cv2.rectangle(img=blank_image, pt1=(ix, iy), pt2=(x, y), color=(255, 0, 0), thickness=-1)
cv2.namedWindow("image")
cv2.setMouseCallback("image", draw_rectangle)
while True:
cv2.imshow("image", blank_image)
# wait 5 seconds then wait for ESC key
if cv2.waitKey(5) & 0xFF == 27:
break
cv2.destroyAllWindows()
References
https://github.com/mhdr/OpenCVSamples/tree/master/011