Archive for the ‘python’ Category

Getting started on Twitter

January 2, 2018 Leave a comment

You have a site and you want to create a Twitter site for it too where you want to send posts, probably in an automatic way.

If you have a gmail account, you can use it to create several Twitter accounts. The trick is to make the e-mail addresses different with a dot. Example: and . If you send an e-mail to these addresses, they’ll arrive in the same mailbox, though Twitter treats them as two different addresses.

Then, follow the steps at to register your app.

Sample Python code
Here is a simple example to post a tweet:

#!/usr/bin/env python3

import config as cfg
import tweepy

def get_api(cfg):
    d = cfg.twitter_keys
    auth = tweepy.OAuthHandler(d['consumer_key'], d['consumer_secret'])
    auth.set_access_token(d['access_token'], d['access_token_secret'])
    return tweepy.API(auth)

def main():
    api = get_api(cfg)
    tweet = "just a test"
    status = api.update_status(status=tweet)    # update_status -> send a tweet

if __name__ == "__main__":
Categories: python, web Tags: , , , ,

TLDR: simplified and community-driven man pages

November 24, 2017 Leave a comment

The TLDR pages are a community effort to simplify the beloved man pages with practical examples.


(I also have a similar project called PrimCom but it has never become popular.)

Categories: bash, python Tags: ,

[android] Mobile C

September 18, 2017 Leave a comment

If you want to develop a C or Python program on your Android device, try Mobile C. Write your program, press a button, and it’s compiled (or interpreted) and executed. Several languages are supported: C, C++ 11, Python 3, JavaScript, Lua.

Categories: android, python Tags:

web server on localhost

September 14, 2017 1 comment

I wanted to share a 3.3 GB big zip file with my students.

I love Python, so I chose this simple trick: “python3 -m http.server“. It starts a web server and makes the content of the current directory available. I shared the URL with my students (10 people) and they started to download the big file at the same time. And it turned out that Python was not a good choice here since only 1 person could download the file and the others had to wait. This solution is single-threaded :(

I hate Node.js but this time it provided the winning solution. Node.js’s async nature was perfect for the job, it could serve several clients. The download rate was not super fast, but at least it worked (and it worked well).

The following tip is from here.

$ sudo npm install http-server -g
[sudo] password for jabba: 
/trash/opt/node-v5.1.0-linux-x64/bin/http-server -> /trash/opt/node-v5.1.0-linux-x64/lib/node_modules/http-server/bin/http-server
/trash/opt/node-v5.1.0-linux-x64/bin/hs -> /trash/opt/node-v5.1.0-linux-x64/lib/node_modules/http-server/bin/http-server

I couldn’t launch it with “http-server“, but the full path “/trash/opt/node-v5.1.0-linux-x64/lib/node_modules/http-server/bin/http-server” did the trick.

Update (20171123)
Following the instructions at, I upgraded my Node.js to version 6.12.0. Then, installing http-server (with sudo npm install http-server -g), I got a link at “/usr/bin/http-server” that pointed to “/usr/lib/node_modules/http-server/bin/http-server“. Thus, I could start “http-server” without modifying the PATH.

Categories: python Tags: , ,


May 20, 2017 1 comment

I wrote a command-line program that outputs the full path of every key / value in a JSON file.


$ ./ sample.json
root.a => 1
root.b.c => 2
root.b.friends[0].best => Alice
root.b.friends[1].second => Bob
root.b.friends[2][0] => 5
root.b.friends[2][1] => 6
root.b.friends[2][2] => 7
root.b.friends[3][0].one => 1
root.b.friends[3][1].two => 2

More information at the project’s github page.

Categories: bash, python Tags: ,

sending e-mails from your app.

If you want to send e-mails from your application, check out You can register for free and with your free account you can also send a good number of e-mails. And if you pay for it, you can send thousands of mails if you want. Their service can be used from Bash, Python, PHP, etc.

On my VPS I used a command-line solution (see here) that sends e-mails with sendmail. Unfortunately, Gmail treats these mails as spam, so it’s not appropriate for sending messages to other people. Mailgun is a better solution.

Categories: api, bash, python Tags: ,

Java profiling

March 18, 2017 Leave a comment

YourKit is a great Java profiling tool. It is a commercial software but you can get a free 15-day evaluation license key for a fully functional version of the profiler.

The past week I was working on a Java project and the software was very slow. Using YourKit I could easily find the bottleneck. It turned out that 94% of the time was spent in a function that I implemented in a naive way. Choosing a better algorithm the software got much faster. A profiler is really useful…

For Java I use Eclipse. YourKit integrates in Eclipse perfectly through an Eclipse plugin.

Python profiling

Here is an excellent post about Python profiling.

Categories: java, python Tags: , ,