Manual:Pywikibot/wikipedia.py

wikipedia.py is a module available with the pywikipedia framework. Despite its name, it can be used not only for Wikipedia, but for all other MediaWiki projects. This module offers some classes and functions to be used in other scripts. Running wikipedia.py itself directly, one would get the version information as output.

Page class, site class and wikipedia.stopme function
The most important class (and the most used) is the Page class. It provides all the common action for a wikipage. To use that, you must first of all call it, and only afterwards can you use its internal function.

In the example, you import the wikipedia module. After that it's needed to define the site where the page is. If you take it how it's done in the example, you'll take the page that is in the project set in user-config.py.

If you want to load the page of a different project you have to do as in the following example. At the end, there is wikipedia.stopme that is needed so that your other bot processes aren't slowed down.

Rewrite code better
In the previous example, you import wikipedia. The site is defined as English Wikisource, with the parameters 'en' and 'wikisource'. Then we define the Main Page as the page to take. And we load the text.

Then we print the text to the screen to let the user read it. Actually, this code is not really clean and good. An experienced coder can improve it as follows.

This code is better than before for many reasons. First of all, it uses a function and it's not procedural as before. In this way, the main function will only be invoked if the script is called directly. This makes it possible to import it from another script, making the code more modular and reusable.

Furthermore, the try/finally block guarantees that stopme is always called, even when an exception is raised. This prevents the slowing down of other process and is quicker when you test a script.

Another interesting new thing is the use of wikipedia.output. It does the same job of printing "something" but, and this is the important thing, it encodes and decodes the text using the encoding defined in user-config. This makes sure that special characters like Umlauts or Cyrillic letters are shown correctly. Note: If you don't put the text in the u"something" (with the u) the function will return a (handled, but ugly to see) error. (the text variable contain already the code encode in a good way, so it won't raise an exception).

Unfortunately, you can't always be sure that the page you are trying to load exists. To prevent that, wikipedia.py will raise a NoPage exception. You can use an except block to solve the problem, as in the following example.

site.allpages function and the wikipedia.py errors
Here, we can see our first generator object that is in wikipedia.py. First of all, we define the site (it's suggested to do it immediately, because it's quite impossible not to use a site's function if you need to work with wikipedia). The second variable is the page from which the Bot will load all the pages on your wikimedia's project.

Then, in the line below, you start a for cycle parsing every page on Wikipedia. Look out, because the function allpages isn't a sub-function of wikipedia, but of site! (so, you can determine from what project you want to load all the pages).

The allpages function has optional parameter, one of these are the start page (default = '!'), then there is the namespace (default = 0), then if you want to include redirects (default: True), and the throttle (default: True). In the example, if you wanted to use the optional parameters as well, you would have used: def allpages(self, start = '!', namespace = 0, includeredirects = True, throttle = True)

In the line below, we load the page's title, in this way you don't print Page but Page, so it's a better output. Two lines below, you find the try/except block.

The Bot tries to load the page and if it doesn't exists (maybe someone has deleted it while the bot was running) it will print only a empty text (you can do what you want, I've choosen this only for explanation purpose). If the page is a redirect, it will notify it and, to make sure that nothing will happend, we put an extreme Exception that don't block the Bot (for example, if there is a Spamfilter's problem, it will be handled in this way). The possible Wikipedia's Errors are:


 * wikipedia.Error               General Error
 * wikipedia.NoUsername          the Username is not in user-config.py
 * wikipedia.NoPage              The Page does not exist
 * wikipedia.IsRedirectPage      The Page is a redirect page
 * wikipedia.IsNotRedirectPage   The Page is not a redirect page
 * wikipedia.LockedPage          The Page is locked
 * wikipedia.LockedNoPage        Page does not exist, and creating it is not possible because of a lock (cascading protection)
 * wikipedia.NoSuchEntity        No entity exist for this character
 * wikipedia.SectionError        The section specified by # does not exist
 * wikipedia.PageNotSaved        Saving the page has failed (General Error)
 * wikipedia.EditConflict        There has been an edit conflict while uploading the page
 * wikipedia.SpamfilterError     Saving the page has failed because the MediaWiki spam filter detected a blacklisted URL.
 * wikipedia.ServerError         Got unexpected server response
 * wikipedia.UserBlocked         Your username or IP has been blocked
 * wikipedia.PageNotFound        Page not found in list

wikipedia.Page(site, pagename).get and wikipedia.Page(site, pagename).put analysis
Now we have only done a few tests, but the real job of a Bot, on Wikipedia, is to modify pages! It's not made to print in a DOS screen what is in a page. So, let's try to make the Bot to put the text inside a page.

Remark: the following code will send an error if the page doesn't exist, to test this condition please use page.exist.

In this script there are options specified that are already set by default. This is to show examples of options that can be used with this useful function. So, you can use text = page.get to load the text and only page.put(newtext, 'Bot: Test') to put the changes, if you don't need to change the other options.

wikipedia.Page(site, pagename).get

 * force = False : if force is set as True, the Bot will ignore all the exceptions raised, included redirects, so you won't get errors (but your code can make mistakes..)
 * get_redirect = False : if it is set to True, the Bot won't stop itself but it will follow the redirect (f.e. if you have Php that redirects to PHP, the bot will load PHP).
 * throttle = True : to slow down the Bot so as not to over-stress the Server. Within wikimedia projects, you must to set it to be True.


 * sysop = False: To get the page as sysop (you can log-in as sysop if you need to edit protected pages or to do something that only sysops can do).
 * nofollow_redirects=False : Like force it won't raise an exception if you load a redirect... but it will raise in all the other cases.
 * change_version_date = True : set it to False if you have already loaded the page before and do not check this version for changes before saving.

wikipedia.Page(site, pagename).put
.put(newtext, comment='Bot: Test', watchArticle = None, minorEdit = True)
 * newtext is the text that you'll put on Wikipedia
 * comment = None : is the comment that the Bot will use when it will make a change. (default = "Wikipedia python library")
 * watchArticle = None : if you want to put the article edited to your bot's watchlist you have to change it to True
 * minorEdit = True : The Bot will make a minor-edit. If it's not necessary, set it to True also if you make big-changes. Note: If you edit a user's talk page, if you want to let them know of the change that you've done, set this parameter to False otherwise set it to True.

If you want to change the default comment, you can use the function wikipedia.setAction(text) to use text instead of "Wikipedia python library" to be sure that your code won't have strange summary's messages.

wikipedia.Page(site, pagename).getReferences, .move, .protect, .delete and .undelete
The Page class has a lot of function that let you make what you want and there are so many function that also what you think that was impossibile to do with a Bot can become reality. For example, do you know that (if you are a sysop) you can load a deleted revision, using the Bot? (and you can also undelete it!) But now it's better to explain the main and most used function (by the way, you can find what you need also taking a look at the code and searching def getDeletedRevision()

wikipedia.Page(site, pagename).getReferences
It's a generator, this means that it returns all the pages that reference to the page defined with the wikipedia.Page class. If you need to load the entire list of referred pages to work with them, use: pages = [page for page in s.getReferences] Like the previous examples, you can use the reference function as: The parameters available are: (follow_redirects=True, withTemplateInclusion=True, onlyTemplateInclusion=False, redirectsOnly=False):
 * follow_redirect=True : as above, it returns also redirects if it's True (otherwise it won't return the redirects)
 * withTemplateInclusion=True : if you use a page as template, in the references appears a "included in page [...]" so, if you need only to load the pages that links to the page, set to True otherwise set to False.
 * onlyTemplateInclusion=False : if True, it will load only the pages that use the page as a Template and not the other.
 * redirectsOnly=False : if True, it will return only the redirects to the page

--- Work in Progress ---