https://wenhan.blog/en/tags/python/ Recent content in Python on Wenhan blog Hugo -- gohugo.io en-US Tue, 05 Sep 2017 10:30:55 +0000 https://wenhan.blog/en/posts/20170905_systemctl-command-return-failed-to-connect-to-bus-no-such-file-or-directory-in-a-docker-container/ Tue, 05 Sep 2017 10:30:55 +0000 https://wenhan.blog/en/posts/20170905_systemctl-command-return-failed-to-connect-to-bus-no-such-file-or-directory-in-a-docker-container/ To enable and start a cron job and a httpd server in a docker container, I tried systemctl command but get an error output like this 1 2 3 4 [root@5f1f0a5cde43 app]# systemctl status crond Failed to connect to bus: No such file or directory [root@5f1f0a5cde43 app]# systemctl status httpd Failed to connect to bus: No such file or directory Fix this issue by add --privileged parameter to docker run command https://wenhan.blog/en/posts/20170728_desktop-notifier-by-python/ Fri, 28 Jul 2017 16:37:40 +0000 https://wenhan.blog/en/posts/20170728_desktop-notifier-by-python/ This article show how to send desktop notice using Python Install requirments we need to install notify2 by pip 1 2 3 4 5 $ pip install notify2 Collecting notify2 Downloading notify2-0.3.1-py2.py3-none-any.whl Installing collected packages: notify2 Successfully installed notify2-0.3.1 Coding First we need to import notify2 1 import notify2 Then need to initialise the d-bus connection. D-Bus is a message bus system, a simple way for applications to talk to one another. https://wenhan.blog/en/posts/20170421_get-weather-info-and-send-by-gmail-python/ Fri, 21 Apr 2017 00:16:17 +0000 https://wenhan.blog/en/posts/20170421_get-weather-info-and-send-by-gmail-python/ After being caught in the rain several times for not checking the weather forecast, I decided to write a small program for lazy people like me. It’s simple, just a small Python exercise: use Python to send daily weather reminders by email. This program is divided into two steps: Get weather information from a website Send the weather information to a specified mailbox by email Getting Weather Information Here I used the popular requests and BeautifulSoup4 libraries to fetch and extract information from a webpage. https://wenhan.blog/en/posts/20161201_crawling-webpage-use-python-requests/ Thu, 01 Dec 2016 00:54:09 +0000 https://wenhan.blog/en/posts/20161201_crawling-webpage-use-python-requests/ Using Python’s Requests library, you can extract and save the contents of a web page. Then, by using the BeautifulSoup library, you can extract the information you want. What is Requests? Requests is a Python HTTP library that is much easier to use than urllib2. As described on the official site: Requests is an Apache2 Licensed HTTP library, written in Python, for human beings. As the description says, it allows you to write code that is easy for humans to read. https://wenhan.blog/en/posts/20161112_google-maps-api-with-python/ Sat, 12 Nov 2016 01:22:46 +0000 https://wenhan.blog/en/posts/20161112_google-maps-api-with-python/ I tried using the Google Maps API in Python to perform route search. The module used is googlemaps/google-maps-services-python You can set up the environment with the following commands. While you’re at it, also install ipython. 1 2 pip install googlemaps pip install ipython You also need to apply for a Google API key, so go to Google APIs to apply and enable it. If everything is fine up to this point, let’s try it out right away. https://wenhan.blog/en/posts/20161029_python-reverse-str-to-check-palindrome/ Sat, 29 Oct 2016 01:21:18 +0000 https://wenhan.blog/en/posts/20161029_python-reverse-str-to-check-palindrome/ I solved another problem: Palindrome chain length This is a calculation problem about palindromes. A palindrome is a string that, when split in the middle, has left and right sides that are symmetric in reverse order. For example, “あいういあ” is a palindrome, while “あいうえお” is not. The same applies to numbers: 5, 44, 171, 4884 are palindromes, while 43, 194, 4773 are not. This problem asks, for a given number, how many times a specific calculation must be performed to make it a palindrome. https://wenhan.blog/en/posts/20161029_python-print-format/ Sat, 29 Oct 2016 00:28:06 +0000 https://wenhan.blog/en/posts/20161029_python-print-format/ I practiced another CodeWar problem today: RGB To Hex Conversion To put it simply, the problem is to convert RGB numbers to hexadecimal and output them. 1 2 3 4 rgb(255, 255, 255) # returns FFFFFF rgb(255, 255, 300) # returns FFFFFF rgb(0,0,0) # returns 000000 rgb(148, 0, 211) # returns 9400D3 If you convert directly with hex, you get an extra “0x” and “00” becomes “0”. I wondered if there was a function like sprintf, and found this site: String formatting like C’s sprintf