python

However, this sort of manipulation of the PYTHONPATH (or of sys. path within a script or Python shell session) is a bit fragile.

Python is an easy to read, use, and learn programming language.

I chose PHP, because that's what I'm most familiar with: You may want to use Ruby or Python, and both of those options are supported.

Then we introduce the concept of a container type and focus on the Python tuple class as the first example of that type.

My first question when I got this far was to ask myself how I would define a class in C that would be visible from Python.

A quick grep among the startup scripts reveals that this is part of the hplip service, which provides "HP Linux Imaging and Printing. "

And when you upgrade to a newer version of Python, you don't have to worry that you might be abandoning existing pickles.

The setup. py script can vary quite a bit in content as you browse around popular Python repositories.

Django comes with its own object-relational mapper (ORM) library that supports dynamic database access through a Python object interface.

Note that cmislib makes getting this object as easy as if you were getting a local folder object from the standard python library.

Remember: it's just a few extra lines of the Perl (or Python, or . . . ) code you already know to give these results.

So, in a second study they used a description of a Monty Python sketch which participants weren't told was supposed to be a joke.

This can be very handy for trying out pieces of code without putting them into a Python script and executing the script.

As you might expect, this is not a good thing, and the Python interpreter won't behave nicely if you try to do it, as shown in Listing 5.

Nonetheless, I noticed something of a disturbing trend in the Python community that prompted this article.

Is an implementation of the high-level, dynamic, object-oriented Python that allows you to run Python on any Java platform.

There has been a good deal of cross pollination between the Java language and Python camps over the years.

It's easy to develop with Pyjamas because you can use the same debugging tools that you usually use for Python.

It assumes that you have no knowledge of that programming language, so some of what you read here might seem a bit basic.

What the Python of a year ago sorely lacked was a sufficient programmatic infrastructure for sharing Python code.

Python is object oriented, which gives it a significant advantage over such other scripting languages as Perl and Rexx.

My hope is to provide a collection of valuable things to watch out for to all those programmers who use Python less than full time.

Of course, as a long-time Pythonista, I find mechanize more robust, which seems to follow the general pattern of the two languages.

A few lines for imports and bindings is not much to do, but letting Python just inherently run much faster would be even more seamless.

At the beginning of this article, I said (in a rather winded manner) that a string in Python is an immutable sequence of characters.

Scientists have used the latest imaging techniques to peer inside the digestive system of a python an hour after it had eaten a rat whole.

By the end of this article, Bash or PHP programmers should be able to jump into object-oriented Python projects without fear.

Neither of the above examples truly shows off the true power of either Perl or Python, nor was that my intent in a short article.

To support this, Python has a way to put definitions in a file and use them in a script or in an interactive instance of the interpreter.

At this point, notice that Python uses zero ordering, where the items in a collection are numbered starting with zero.

Python Definition: Python is an object-oriented, open-source programming language often used for rapid application development.

Python is usually fast enough for what you want it to do.

Python is roughly comparable to Perl or Java, though it has several significant strengths (and a few disadvantages) over each.

Another example of the differences in the implementation completeness is that the Python implementation seems to have stalled recently.

Python was designed with a small core and a large set of extension libraries, making the language extremely compact and flexible.

A practice millennium python seeing, changes into an elegant young man, spits into the borneol in his mouth.

Suggests that Python Web services implementations were not the only ones having trouble with the air fare quote service.

Dolce & Gabbana has a magazine advertisement showing a man in briefs sunning himself with an enormous python crawling over his body.

Dynamic languages like Python and Ruby seem to be all the rage these days.

There seems to be a bug in the PyGTK 0. 6. 8 Configuration script that affects those without a site-wide Python installation.

For that reason -- as well as for comparison -- we wanted to point out some of the other popular GUI toolkits for Python.

For this article, it's necessary to have a reasonably up-to-date Python installed on your *nix machines, which means Python 2. 3 or greater.

Two other features help you write easy-to-read programs in Python, and they both follow from the book analogy used earlier.

Actually, it's very easy to create powerful and truly cross-platform user interfaces with Python.

But of particular value relative to this article is Hettinger's explanation of the lookup chain that underlies Python's concept of OOP.

An instance is a Python object that was "manufactured" by a class; the class acts as a sort of template for the instance.

Python provides multiple methods for installing an application, including the ability to compile the source into a more compact form.

Until now it's been a scientific mystery how the python's body accomplishes this "extraordinary" feat, Leinwand said.

Participants reacted to the meaning threat implicit in Python by handing out a larger notional punishment to a lawbreaker.

Our initial puzzle illustrates this. Suppose that you were given N characters of code that you knew to be either C, C , Java, or Python.

The issue of Python is another one of those make-or-break questions you'll come up against in deciding on your cloud computing platform.

Down, move up, then down, then move up, pre-labor python, painful I do not know how to put her body.

For one thing, that it's easy to get help from the Python interpreter, but more on that later.

But as soon as you want complex user interaction -- especially explicitly graphical interfaces -- Python offers practically nothing.

But thanks to one eager rock python we're going to see some things not advertised in the safari brochures.

Python commands may be typed into the Console and executed just as they are when executing Python from the command line.

Luckily, most shared Web-hosting providers include Python support, so it is possible to deploy Django applications in this scenario.

Furthermore (and for the same reason), earlier versions pickled every attribute as a deep copy of its actual Python object.

Of course, at least in Python, the verification or enforcement of declared rules will always boil down to procedural checks.

Looking at this example, you should get a good feeling for how simple it is to put a Python program in a file and have it run.

A Python script is so much more flexible than Java Property file that the possibilities are limited only by your imagination.

Once compiled with a C compiler, these Pyrex (the language) modules can be imported into and used in your regular Python applications.

With the other Python SOAP implementations we have had to hack at the client library code to sort out interoperability problems.

Writing scripts to interact with Web sites is possible with the basic Python modules, but you don't want to if you don't have to.

Python is not the only programming language to have a binding for accessing the wxWidgets library.

Zhu went out to investigate, and there, a few paces from his door, he saw a huge python!

Then create a small Python script that informs Apache of the various settings for your Django project and executes the FastCGI program.

PEAK, or the Python Enterprise Application Kit, combines some elements of all of these into a component programming framework.

In this case, you create an implicit file object, and Python does the rest, allowing you to iterate over all the lines in the file.

To use it, set a breakpoint by clicking to the left of the line of code you'd like to break on within the Python editor.

The techniques here can be applied many times to different objects, allowing you to use any GObject you find in Python.

Psyco: Learn more about this Python extension module that can massively speed up the execution of Python code.

I included the running time of the Python implementation as a baseline ; this version is completely non- optimized .

Moreover, its convenient integration into the Python interactive shell makes for a delightfully productive development environment.

Perhaps the quickest check to see whether command line editing is supported is typing Control-P to the first Python prompt you get.

The balls disappeared, and the couple found a lumpy-looking carpet python nearby.

One area in which a Python script portability falls far short of a Java application's portability is in the user interface.

It acts like a Python dictionary that allows objects to be placed at (and later deleted from) names identified by string-typed keys.

PHP has an array type that doubles as as a simple list and a dictionary or hash; Python separates the two.

Python contains a mixture of casts and coercions, with a usual preference for the former ( "explicit is better than implicit" ).

Such a descriptor could return something callable -- any Python function or method can return anything, after all.

This example iterates over all the items in a Python list and prints each item and its corresponding Python type on a separate line.

The ball python, because of its appeal, availability and price, has become one of the most commonly kept reptile pets today.

That's changed a bit in the last few months -- now the book in arm's reach is the second edition of Python Essential Reference.

By using IPython, it is now possible to combine the best features of a Python shell, UNIX shell, and your favorite text editor.

The MayaVi shell around VTK can be imported as a Python module from other Python programs and scripted through the Python interpreter.

All the dynamic information to be inserted into the static template definition must first be broken down into basic Python data types.

Serpent blood spurted through the air, and in a minute, the huge python was dead.

Or, you could use any of Python's other functions for finer control of an external process.

Python has extensive support for handling all types of exceptions but, for the purposes of these example programs, I've kept it simple.

Once you press Enter following the last three-dot Python prompt, the Python interpreter starts churning away in an infinite loop.

Spark is the first Python program I've used where I really found the speed penalty of an interpreted language to be an major issue.

We don't want to have to specify the length of the string in Python code, so we change the isi to is#.

To tell Python that an integer should be treated as a long, simply append an L to the end of the number, like 100L.

It's basically a Python wrapper around the wxWindows library, a very fast and complete cross-platform windowing framework.

There are numerous third-party libraries available for converting Python objects to JSON and vice-versa, but we did not need them.

As he related in the Python Business Forum mailing list, he had implemented an XML processor that required eight hours to complete its task.

Because working with text-based data is a common practice, you might be wondering how Python deals with character-based data.

The data store is well-suited for your hybrid application, and it takes very little Python to whip up a RESTful interface to your queue.

This analogy extends to the Python programming language and the special container type known as a dictionary.

This line of thinking will then lead you to a module called perlmodule, which lets you embed a Perl interpreter in Python.

SQLObject is the object-relational mapper (ORM) library that allows you to develop database-persistent Python objects.

Perl used to be the recommendation, but Python is now quite mature, and is possibly easier to learn.

"The most temperate of the species is the Burmese python, " he said.

Even Python beginners should be able to follow the subsequent directions.

The syntax of YAML combines the contextual typing of Perl, the indentation structure of Python, and a few conventions from MIME standards.

Do you know why snakes like the Python shown above always keep the eyes open?

This is nothing more than a convention: the name self has absolutely no special meaning to Python.

To tell Python which stats method you want to call, you must provide the full name.

Of course, when you start talking about making Python(-like) modules fast, Pyrex is not the only tool there is.

In addition, Python makes it easy to determine a variable's type, using the type function.

This is a common situation (most Python programs do not use threads), and the lock operations slow the interpreter down a bit.

To run the statements in this file, you need to start a Python interpreter and tell it to read and process the contents of the file.

The previous articles in this series also showed some simple Python examples that manipulated variables that held data of these four types.

Fundamentally, the order of the items in a dictionary is controlled by the actual implementation of the Python dictionary data type.

As an official Python data type, dictionaries support the majority of operations you may be familiar with from other, simpler data types.

Before you do this, read the following sections to understand how the agent and Python code work.

However as Neo has been impressed by Python's productivity gain before, he wondered if he could write code in Python to use DB2 JDBC driver.

With only a tiny amount of extra programming, Psyco can often be used to increase the speed of Python code by orders of magnitude.

PyGTK is GTK for Python; it allows you to easily create programs with a graphical user interface using the Python programming language.

While this package has little to do with Python development, I feel that it is a good final task for our two Content Component parts.

In contrast to PLY or Spark, DParser itself is written in C, and is thus likely to be considerably faster than pure-Python parsers.

Automatically generating a set of Python validity classes from a DTD or XML Schema would be nice.

Indeed, given its prevalence in Python, Perl, and Apache projects, expat is clearly one of the most widely-used XML parsers available.

Python was the libvirt-supported scripting language and provides a clean, object-oriented interface to the libvirt API.

It turns out to be quite easy (about 100 lines of [Python] code) using two ideas: constraint propagation and search.

Hidden in a Florida swamp, he added, the African python "could strike you and you wouldn't even know it was there. "

For the first time, Python developers had a single place to turn for (nearly) all contributed third-party modules, packages, and tools.

Without a templating system, you'd use Python code to generate pieces of text like the example e-mail message.

Floating-point values in Python are always done in double precision; hence, Python float types correspond to doubles in a C-like language.

I took a very superficial look at some of the common features and differences in two of the more popular languages, Perl and Python.

Doctests are a wonderful feature of Python, because among other things, it allows for a way to create testable documentation for an API.

Python provides a simple mechanism for combining these two concepts, called List Comprehensions, which will be covered in a future article.

The type coercion rules have changed to preserve types in arrays (more often), rather than converting to the type of a Python scalar.

This example shows off the extensive number of functions the Python Standard Library os module provides.

I try to explain the Python code so that you need no more than a basic understanding of the language to follow along.

It reads a Prolog data file like the sample, then creates Python objects to model the Prolog declarations.

Once you've downloaded it, unarchive it and execute python setup. py install, and you'll be ready to use it.

As the previous examples illustrate, all statements in Vimscript are terminated by a newline (as in shell scripts or Python).

And if you want curses, as the Monty Python Flying Circus skit reminds us, you'll need to go down the hall.

Obviously, many excellent Python programmers disagree with me on this.

The latest version of Python (version 2. 6. 1) ships with SQLite3 and is what I used for this project.

I honestly don't know whether the top-line productivity is as high as Python and Ruby, but I don't have any evidence that it is not.

Later, he grabs the Sword of Gryffindor and chops the head off a python in a manner that suggests he is onstage at a Black Sabbath concert.

Readers who wish to use xml_indexer as part of their own larger Python projects should find its further specialization equally simple.

Second, everything in a Python program is an object accessible from within your program, even the code you write.

Well, the answer is no, at least in Python.

Python allows you to do any number of string-based operations.

You can use either type of quotation mark to indicate a string in Python, as long as you're consistent.

Python's readlines routine is used to read all lines in a file into a list of strings.

Installation is simple: just create a directory and unzip the archive to a location on your Python path.

In the last five years the list of virgin mothers has expanded to include a python, hammerhead sharks, blacktip sharks, and Komodo dragons.

The Zope 3 binary distributions are always compiled with the same compiler as the standard Python distribution for the operating system.

In Python, a function is a first-class object, like an integer variable or a container object.

Monty Python came up with a semaphore version of Wuthering Heights, the novel that also gave Kate Bush her debut single.

Formally, a complex number has a real and an imaginary component, both represented by float types in Python.

This deluge of options harms the regularity of Python and makes it harder to understand for non-experts (and even for experts).

In an Indonesian slaughterhouse workmen slit open wild-caught blood python s, pumped full of water and air for ease of skinning.

There is also an API that you can script against, so you can combine what you've learned here with a full-blown Python NMS.

We were unable to support some of the new Python features with jythonc because of its internal design.

If you can wrap new widgets as you find them, you can use them in your Python programs right away.

By publishing your package on the Python Package Index (PyPI), you'll make it easily accessible through utilities like pip or easy_install.

Which extends Python with a full scientific array language complete with sophisticated indexing.

As in Python string literals, the backslash can be followed by various characters to signal various special sequences.

My path never took me too far down the Perl road, but I taught myself Python using the excellent and free online book, Dive into Python.

Stackless Python implements concurrency through the use of its own scheduler and special primitives called "tasklets. "

The specifics of what this support function will do depend, in general, upon the states of various Python objects held in memory.

To actually use SQLObject, you need to set up a database package and the Python interface to that type of database.

A month before I started this article I was looking for a small project that I could use to teach myself Python.

People are really getting caught up in Python mania.

In the hand-written Python code, each item of output had to be appended manually to the list l of output strings.

He describes PEP 249 as the Python Database API Specification which needs to be followed to create the basic database provider used.

When you use the Python debugger, be sure you add the Pyjamas and Pyjamas-Desktop libs to your path, as shown in listing 10.

The simplest way to call Python from Zope is to make your Python code an External Method.

A clean, and non-ugly, solution to the above need might be to add class decorators to Python.

In the year since those initial writings, however, the state of XML tools for Python has advanced significantly.

And " Discover Python, Part 5" introduces the concept of compound statements in Python, and the if statement and the while loop.

The pipe symbol indicates that the message's contents should be sent as input for the indicated program: a Python script named aci. py.

Downloads, late developments, and documentation for the Python language can be found at the.

It's important to note that Django's template system does not allow Python code to be executed directly from the template.

Image 2: A researcher measures the length of a captured Burmese python.

The page refers to it as a structured data type similar to variables in Python or Perl.

TurboGears is one of the first large Python projects to use setuptools for distribution and installation.

Quite a number of Python programmers have recommended Spark to me.

The scripts directory contains python scripts used to install and uninstall the application.

Is an all-Java application that allows developers to use the syntax and most of the features of the Python programming language.

If you haven't already done so, fire up a Python interpreter and try some of the ideas I've discussed.

The for loop in Python is special and is closely tied to the container data types built into the Python programming language.

In terms of promise, however, anygui excites me more than any Python library I've seen in a good while.

Given that background, you might wonder if the same tricks can be applied to the Python string.

If PyDev is not able to find your Python interpreter, or if you want to use a different one, configure it here (see Figure 2).

This Python module can be used as a runtime utility and can also be easily extended by custom applications that use its services.

In particular, it is not very Pythonic to access data using getters and setters, or other similar methods.

PyTyle is a Python script intended to mimic the behaviour of a tiling window manager within a different window manager.

SQLObject has a setup. py file and installs in the same way as any other Python package.

With some fairly simple changes, you made a Python script call a Ruby script, and it just looks like a normal call to another Python module.

The standard Python system comes with a variety of modules well-suited to Internet development.

Given the effective requirement for Python 2. 0 in terms of the XML packages, I also allowed in a few other changes with Python 2. 0 syntax.

Then any time python sees length in the body of the function, it substitutes that value.

We need to know that we are in a "blockquote" state to determine that the line is part of a comment rather than a Python action.

Therefore, within the deployer, a mapping is required between the Python data types and the XML schema data types.

For purposes of my testing, I used a Python implementation created by a correspondent of mine named John Barham.

In fact, one of the main joys of using Python is the well organized and ever useful Python web site.

But the language of a DTD is un-Pythonic, and xmlproc just uses it as data that needs to be parsed.

Most popular programming languages have several built-in data types, and Python is no different in this respect.

Looking over the procedural Python version of our code, it quite similar to both the Bash and PHP versions.

Note how the Java structure is essentially identical to the Python code, except for the obvious language differences (see Listing 5).

Two tools that simplify working with XML in an object-oriented manner (in Python) are David Mertz' xml_objectify and xml_pickle.

One of the most popular bindings is the Python set, developed by the PyGTK project.

The PyDev project is a set of open source development tools for the Python programming language.

Because life isn't described by simple concepts, Python provides a rich set of container, or collection, objects.

You might be surprised here if you are unfamiliar with the trick--Python does not have an "official" static scoping declaration.

Best of all, Txt2Html uses a number of programming techniques that are common to a lot of different Web-oriented uses of Python.

The dictionary container type in Python is different from the other three container types in that it is an unordered collection.

The backward incompatibility with Python 1. 5 is unfortunate, but it would be too unwieldy to maintain it in this case.

Python is an accessory. Crocodile is still about pure luxury.

Change into this directory and run setup. py to install boto into your local Python environment, as shown in Listing 1.

In particular, to use Pyrex, you write functions in a Python-like language that adds type-declarations to selected variables.

Putting REs in strings keeps the Python language simpler, but has one disadvantage which is the topic of the next section.

Members of the XML-SIG (Special Interest Group) do much of the work of maintaining a range of XML tools for Python.

The Python interpreter provides the only two bool objects needed: True and False.

Next, you use the Jython API to extract that list out of the Python runtime environment.

Jython is an implementation of the high-level, dynamic, object-oriented (OO) language, Python.

Also like the Burmese python, the African snake is a constrictor.

Of course, the guilt of the authors is obvious here: our earlier installments on metaclasses in Python helped popularize their usage.

" Connecting databases to Python with SQLObject" mentioned the wide variety of open source object-relational mapping libraries for Python.

The power of Python is in its flexibility and simplicity.

As you can see, the applications (the one written in Java and the one written in Python) look similar in their windowing displays.

The commotion brought out the neighborhood. Nobody dared approach the python, but they all cheered on the four brave dogs from a distance.

If you run an ls command in this directory, you'll see a number of directories that contain the Python source for Sugar applications.

It's by no means comprehensive, I had to cut stuff to get just 10 (including their tendency to start randomly quoting Monty Python).

In Python you indicate a unicode string by prepending a u, as you can see in the second line of the session.

Is one of the most-used constructs in the Python programming language.

It will take a little while for Python programmers to become familiar with the ins-and-outs of generators.

At the same time, we saw that Python is able to maintain references between objects that are pickled as a unit.

The author particularly recommends ActivePython for Windows users interested in Python, because of the reliability of its installation.

Note: I don't recommend doing significant Python programming without a good Python IDE like Eclipse with Pydev.

Write a few sizable non-graphical programs in python - parse some text files, write a guessing game or a journal-entry program or something.

Packages are a way of structuring Python's module namespace by using "dotted module names" .

Check to make sure everything is set up correctly by starting a Python shell and importing the boto library, as shown in Listing 3.

Python comes with a few built-in templating systems, which work well in simple cases.

Returning briefly to my first article in this column, Python is a free, high-level, interpreted language developed by Guido van Rossum.

In several previous articles, I have advocated the clarity and simplicity of my own Python xml_objectify module.

To emphasize the open, cross-platform nature of SOAP applications, I will look at clients written in Perl, Python, and PHP.

For the most part, when you want a third-party Python module or package, it is to accomplish some specialized and unusual task.

As noted, indentation in Python has meaning: You'll learn this the hard way in your first few days with the language.

Another idea is to require python owners to have their pets fitted with microchips.

PyDev re-parses the Python file as it is being edited, and updates the Outline view, performs syntax checking, and syntax coloring.

The last few pages of the book have a pretty good set of FAQ-type questions about Python.

These map directly to the corresponding Python request objects, and are used to perform actions on the registry.