Feb 5

… and the python needed to get wordpress to show the code properly

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#!/usr/bin/python

"""
    py2html

    Prepare a python script for posting on a wordpress blog

    USAGE:

    py2html <mypython.py >myhtml.html

"""

import sys,re

mapping=[
    ('&','&'),
    ("'",'''),
    (' ',' '),
    ('"','"'),
    ('<','<'),
    ('>','>')
]

print '<PRE>'
for l in sys.stdin:
    for (fro,to) in mapping:
        l=l.replace(fro, to)
    l=l.strip()
    print '%s<BR />'%l
print '</PRE>'

(I only posted that so I could have the pleasure of running a program with itself as input)

/edit: I just re-did the other listing with http://tom.idealog.info/blog/20031205-1070600658.shtml … though I needed to re-do the “quote” function in there to use the “mapping” from above.

Feb 5

Python Generator Example

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 #!/usr/bin/python

 """
     yield.py
 
     Demonstrates a recursive generator method.  This allows very large nested
     Container structures to be created, and when rendering to a string, we don't
     need to create the whole thing in memory (handy if, like me, you want to
     create 160,000 line XML files.
 """


 class Container(object):
     def __init__(self, name, contents=[]):
         self.tag=name
         self.contents=contents
     def lines(self):
         """ Iterate over the text representing the Container and its contents. """
         # This is a generator function; really it returns an iterable object.  The
         # only reason you know this is that it contains the yield statement.  On
         # one hand, a nasty gotcha for the rookie pythoneer, on the other hand, a
         # lovely concise way of doing something you will want to do often.
         yield "<%s>"%(self.tag.upper())
         if isinstance(self.contents, str):
             yield self.contents
         else:
             for x in self.contents:
                 if isinstance(x,Container):
                     for l in x.lines():
                         yield l
                 else:
                     yield x
         yield "</%s>"%self.tag


 # Declare a structure of nested Container objects
 c=Container('HTML', [
     Container('HEAD', [
         Container('TITLE',[
             "The quick and the Dead"
         ])
     ]),
     Container('BODY', [
         "The quick, that's me, and the dead, that's you.",
         Container('Blockquote', "Ar wuz never wun te be hackin' about this here county")
     ]),
 ])


 # Now write the structure's text representation out.
 for l in c.lines():
     print "Line: %s"%l