Skip to main content

Powerful polling utility with many configurable options

Project description


Polling is a powerful python utility used to wait for a function to return a certain expected condition.
Some possible uses cases include:

- Wait for API response to return with code 200
- Wait for a file to exist (or not exist)
- Wait for a thread lock on a resource to expire

# Installation

pip install polling

# Examples

### Example: Poll every minute until a url returns 200 status code

import requests
lambda: requests.get('').status_code == 200,

### Example: Poll for a file to exist

# This call will wait until the file exists, checking every 0.1 seconds and stopping after 3 seconds have elapsed
file_handle = polling.poll(
lambda: open('/tmp/myfile.txt'),

# Polling will return the value of your polling function, so you can now interact with it

### Example: Polling for Selenium WebDriver elements

from selenium import webdriver
driver = webdriver.Firefox()

search_box = polling.poll(
lambda: driver.find_element_by_id('search'),
search_box.send_keys('python polling')

### Example: Using the polling timeout exception

# An exception will be raised by the polling function on timeout (or the maximum number of calls is exceeded).
# This exception will have a 'values' attribute. This is a queue with all values that did not meet the condition.
# You can access them in the except block.

import random
polling.poll(lambda: random.choice([0, (), False]), step=0.5, timeout=1)
except polling.TimeoutException, te:
while not te.values.empty():
# Print all of the values that did not meet the exception
print te.values.get()

### Example: Using a custom condition callback function

import requests

def is_correct_response(response):
"""Check that the response returned 'success'"""
return response == 'success'

lambda: requests.put('', data={'username': 'Jill'},

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for polling, version 0.2.0
Filename, size File type Python version Upload date Hashes
Filename, size polling-0.2.0.tar.gz (4.7 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring DigiCert DigiCert EV certificate Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page