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Python course in Milan, Italy

In the last two days I gave an intensive Python course at the University of Milan, Italy. It was good. As I saw the students liked it too :)

blog

Here is the schedule of the course:

Day 1
=====
- introduction
- string data type
- list data type
- loops (for, while)
- tuple data type
- list comprehension
- control structures
- functions

Day 2
=====
- set
- dictionary
- global variables
- file handling
- classes, objects
- modules
- random numbers
- downloading webpages
- JSON serialization
Categories: python Tags: , , ,

touch a file

Problem
In bash, the command “touch” creates an empty file (with size 0). How to do this in Python?

Solution
Simply open a file in write mode and write an empty string to it.

With the stdlib:

with open("empty.txt", "w") as f:
    f.write("")

With the excellent unipath library:

p = Path("empty.txt")
p.write_file("")

Note that this solution will overwrite your file if it exists. So be careful.

Categories: python Tags: ,

Simplicity is the final achievement.

Simplicity is the final achievement. After one has played a vast quantity of notes and more notes, it is simplicity that emerges as the crowning reward of art.

Frederic Chopin

Categories: python Tags: , ,

how to become a data scientist in Python

In this post I found a detailed learning path on how to become proficient in data science.

They also made an infographic (see this post).

data_scienceClick to see the full version.

(Here is a backup of the image if the original site went down.)

creating a Python 3 virt. env. on Ubuntu

Problem
Python 3 on Ubuntu is sometimes a total mess. I wanted to create a Python 3 virt. env., but I got this error:

$ virtualenv -p python3 venv
Running virtualenv with interpreter /usr/bin/python3
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 8, in 
    import base64
  File "/usr/lib/python3.4/base64.py", line 9, in 
    import re
  File "/usr/lib/python3.4/re.py", line 324, in 
    import copyreg
  File "/usr/local/lib/python2.7/dist-packages/copyreg.py", line 3, in 
    from copy_reg import *
ImportError: No module named 'copy_reg'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 53, in apport_excepthook
    if not enabled():
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 24, in enabled
    import re
  File "/usr/lib/python3.4/re.py", line 324, in 
    import copyreg
  File "/usr/local/lib/python2.7/dist-packages/copyreg.py", line 3, in 
    from copy_reg import *
ImportError: No module named 'copy_reg'

Original exception was:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 8, in 
    import base64
  File "/usr/lib/python3.4/base64.py", line 9, in 
    import re
  File "/usr/lib/python3.4/re.py", line 324, in 
    import copyreg
  File "/usr/local/lib/python2.7/dist-packages/copyreg.py", line 3, in 
    from copy_reg import *
ImportError: No module named 'copy_reg'

Awesome! :(

Solution
I found a working solution here. The following command let me create a Python 3 virt. env.:

python3 -c 'import sys; del sys.argv[0]; s = sys.argv[0]; exec(open(s).read(), {"__file__": s, "__name__": "__main__"})' `which virtualenv` -p python3 venv 

Life on Arch / Manjaro is easier. There Python 3 has been the default for years.

PyCon US 2015 videos

April 19, 2015 Leave a comment

PyCon US 2015 took place in Montréal, Canada (just like last year). The videos are being uploaded to pyvideo.org. I think we need some more weeks till all the videos get uploaded but at the moment of writing this post there are already 134 videos available.

Here is a nice script of mine (pyvideo_popularity.py) that orders presentations by popularity.

Categories: python Tags: , ,

Talk Python To Me: a Python podcast

April 10, 2015 Leave a comment

I just found this Python podcast: http://www.talkpythontome.com/. In the latest episode you can find an interview with “Jesse Davis from MongoDB. Jesse is the maintainer for a number of popular open-source projects including the Python MongoDB driver known as PyMongo and Mongo C (for C/C++ developers, yes you read right! C developers). Jesse discusses how interesting it is to write both Python and C code and how it reawakens part of the brain.” (source)

Categories: podcast, python Tags: , ,
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