Review of Learning IPython for Interactive Computing and Data Visualization

valuable but traditional

May 25, 2013 by Catherine Devlinphoto of 'Learning IPython for Interactive Computing and Data Visualization' 4 stars (of 5)

Packt Publishing recently asked if I could review their new title, Learning IPython for Interactive Computing and Data Visualization. (I got the e-book free for doing the review, (more...)

cannot import name MAXREPEAT

When I upgraded from Xubuntu 12.10 to 13.04 today, all my existing Python virtualenvs broke! Fortunately, they're just virtualenvs and easy to replace (that's kind of the point). But don't panic if you start seeing these.


$ ipython
Traceback (most recent call last):
File "/home/catherine/ve/e2/bin/ipython", line 5, in
(more...)

Speak at PyOhio

Have you responded yet to PyOhio's Call For Proposals (due date: June 1)? You should. Here's why.

Why you should speak at PyOhio

  • We need you. We have a great group of people who contribute talks, but we don't ever want that group to become a stagnant pool - we (more...)
  • ipython-sql for multi-database comparisons

    For my newest ipython-sql trick, I needed to compare some queries run across different databases. How hard would it be to get side-by-side results into tidy IPython Notebook output?

    Not hard at all, it turns out, if you're willing to violate basic principles of human decency.

    That's an itty-bitty image, (more...)

    Linux Installfest, Dayton, Sat April 13

    Dayton folks - are you coming to the Dayton Linux User Group's Installfest tomorrow?

    The main point of our Installfests is to get everyone together for mutual help setting up and configuring computers and programs. But we like to throw in some educational talks, too, and I volunteered to give (more...)

    %sql to Pandas

    After getting %sql magic for IPython working, my next big goal was to figure out how to get those results into Pandas.

    Er, OK, not such a big goal. Even with zero Pandas experience, it took about five minutes of skimming the first page of documentation to figure out:


    In (more...)

    released: %sql magic for IPython

    Inspired and informed by discussions with the IPython developers at PyCon 2013, I've released ipython-sql, a %sql magic for IPython.

    With this, I really think the IPython Notebook will become the most amazing database tool ever. In fact, virtually every computing problem will become a lot more workable when (more...)

    The Canadian menace

    Incidentally, some people have been asking, "Wait a minute - PyCon-US in Canada? How does that work? Wouldn't it be more correct to call it PyCon-NA for North America?"

    It might, if this were a case of nations cooperating to share PyCon. However, that is not the case. You (more...)

    Living in the Future

    On my morning commute today I realised that I am actually living in the future. I remember when I got involved in the PythonCard project 10 years ago one of the major questions on the mailing list was why we were building a GUI toolkit when the future was the web. It wasn’t true then but I think that it is now.

    Why do I think we have moved now? It is in large part thanks to a book I have started reading called Python for Data Analysis. I have a copy of the book in ePub format and wanted (more...)

    The Full Monty – from Ruby to Python n00bie

    Ruby developers are a pretty spoilt bunch these days. The community has overall done a great job of rolling many of the advances in modern development practice into the tools and conventions we unconsciously put to work every day.
    Now I wonder what life is like in the Python community? Like many Rubyists, I've played around with Python and Jython on and off. But nothing serious. And although you could get into a pedantic syntax war, I suspect for the most part the Python and Ruby communities don't overlap simply because once you dive into one camp, the only real (more...)

    Separate docs for MySQL Connectors

    The MySQL documentation section has always had this Topic Guides page containing links to the docs for the various MySQL Connectors -- the official database drivers for various languages and programming technologies. That is the most convenient way to get the information for each Connector in PDF form, rather than downloading the entire Ref Man PDF. For HTML, it was more of a shortcut, because

    Python path relative to application root

    I’ve recently written some code to wrangle XML files. Part of the code validates a provided file against an XML Schema stored in a file. When I wrote this code I got tangled up in absolute and relative path manipulations trying to load the XML Schema file. Most of the Python file operations work relative to the current working directory and I needed to be able to load my XML Schema from a file relative to the application root directory. Regardless of where the code was executed from the schema file would always be up and across from the directory (more...)

    Extracting a discrete set of values

    Today’s I love Python moment is bought to you by set types.

    I have a file, XML naturally, the contains a series of transactions. Each transaction has a reference number, but the reference number may be repeated. I want to pull the distinct set of reference numbers from this file. The way I learnt to build up a discrete set of items (many years ago) was to use a dict and set default.

    >>> ref_nos = {}
    >>> for record in records:
    >>>     ref_nos.setdefault(record.key, 1)
    >>> ref_nos.keys()
    

    But Python has had a sets module since 2. (more...)