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Merge pull request UWPCE-PythonCert#85 from ARSimmons/master
HMWK from 6 & 7 also initial code for class project
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‎Students/ASimmons/Session06/html_render.py‎

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__author__ = 'Ari'
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# STEP 1:
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# -
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# Step 3:
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# - create a head element
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# Step 4:
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# - create a class to accept a set of attributes
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# remember "**kwargs" --
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# Step 5:
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# - create a SelfClosingTag
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class Element(object):
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# 4 spaces = indent,
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# these are called class attributes
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indent = ' '
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## chris used **attributes instead of **kwargs
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def __init__(self, content=None, **kwargs):
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# we have a dictionary of keys
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self.attributes = kwargs
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self.content = []
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if content is not None:
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self.content.append(content)
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def append(self, content):
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self.content.append(content)
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def render_tag(self, current_ind):
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# because there is some code duplication in OneLineTag and def render
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# we wrote this to deal with the tag formatting
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attrs = "".join([' {}="{}"'.format(k, v) for k, v in self.attributes.items()])
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tag_str = "{}<{}{}>".format(current_ind, self.tag,attrs)
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return tag_str
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def render(self, file_out, current_ind=""):
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"""
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render, just renders itself
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"""
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# from kwargs...need to format a dictionary of items, replaced with render_tag
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#attrs = "".join([' {}="{}"'.format(k, v) for k, v in self.kwargs.items()])
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# file_out -- File name in which to output render
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# a file_out has a write method
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# carriage return is necessary
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# so you could have file_out.write("<html>\n")...
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# but once you start using the class Html..
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# this isn't going to work so well (so '.format' to the rescue)
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file_out.write(self.render_tag(current_ind))
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# adding the carriage return since we took it out of render_tag
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file_out.write('\n')
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# append content in a list as entered
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# print self.content
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for con in self.content:
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#print "trying to render",con
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try:
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file_out.write(current_ind+ self.indent + con+"\n")
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except TypeError:
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# in order to have indent = ""...we are modifying the
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# embedded element to add an indent
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# by
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con.render(file_out, current_ind+self.indent)
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file_out.write("{}</{}>\n".format(current_ind,self.tag))
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class OneLineTag(Element):
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def render(self, file_out, current_ind=""):
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file_out.write(self.render_tag(current_ind))
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for con in self.content:
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file_out.write(con)
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file_out.write("</{}>\n".format(self.tag))
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class Title(OneLineTag):
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tag = 'hr'
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class SelfClosingTag(Element):
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def render(self, file_out, current_ind=""):
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# a little array slicing notation
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file_out.write(self.render_tag(current_ind)[:-1])
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file_out.write(" />\n")
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class Hr(SelfClosingTag):
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tag = 'hr'
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class A(OneLineTag):
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tag ='a'
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# it is content, and not self.content because you
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# haven't assigned it
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def __init__(self, link, content, **kwargs):
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OneLineTag.__init__(self, content=None, **kwargs)
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self.attributes["href"] = link
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class H(OneLineTag):
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def __init__(self, level, content=None, **kwargs):
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OneLineTag.__init__(self, content, **kwargs)
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self.tag = "h%i"%(level)
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class U1(Element):
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tag = "u1"
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class Li(Element):
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tag='li'
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class Html(Element):
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tag = 'html'
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def render(self, file_out, current_ind=""):
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file_out.write("<!DOCTYPE html>\n")
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Element.render(self, file_out, current_ind=current_ind)
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class Body(Element):
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tag = 'body'
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class P(Element):
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tag = 'p'
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class Head(Element):
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tag = 'head'

‎Students/ASimmons/Session06/run_html_render.py‎

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__author__ = 'Ari'
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from cStringIO import StringIO
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import html_render as hr
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reload(hr) # for ipython
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## writing file out
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def render_page(page, filename):
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"""
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render the tree of elements
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"""
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f = StringIO()
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page.render(f, " ")
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f.reset()
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print f.read()
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f.reset()
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open(filename, 'w').write(f.read())
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page = hr.Html()
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head = hr.Head()
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#head.append(hr.Meta(charset="UTF-8"))
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head.append(hr.Title("some stuff ex"))
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page.append(head)
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body = hr.Body()
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body.append(hr.H(2, "Python Class - Hmwk 6 ex"))
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body.append(hr.P("Here is a paragraph - keep reading!!",
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style="text-align: center, font-style: oblique;"))
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body.append(hr.Hr())
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list = hr.U1(id="TheList", style="line-height:200%")
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list.append(hr.Li("the first item"))
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list.append(hr.Li("the second item", style="color: red"))
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item = hr.Li()
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item.append("And this is a ")
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item.append(hr.A("http://google.com", "link"))
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item.append("to google")
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list.append(item)
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body.append(list)
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page.append(body)
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render_page(page, "test_html_outpt.html")

‎Students/ASimmons/Session06/test_html_outpt.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<hr>some stuff ex</hr>
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</head>
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<body>
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<h2>Python Class - Hmwk 6 ex</h2>
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<p style="text-align: center, font-style: oblique;">
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Here is a paragraph - keep reading!!
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</p>
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<hr />
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<u1 style="line-height:200%" id="TheList">
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<li>
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the first item
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</li>
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<li style="color: red">
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the second item
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</li>
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<li>
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And this is a
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<a href="http://google.com"></a>
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to google
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</li>
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</u1>
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</body>
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</html>

‎Students/ASimmons/Session07/Session7_notes.txt‎

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Python Session 7
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## Mixin's
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Mixins are a sort of class that is used to
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"mix in" extra properties and methods into a class.
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## New-Style Classes
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super(): use it to call a superclass method, rather than explicitly calling the unbound
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method on the superclass.
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Way to call a method on class
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ex:
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instead of:
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class A(B):
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def __init__ (self, *args, **kwargs)
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B.__init__(self, *args, **kwargs)
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you can:
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class A(B):
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def init
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super (A, self).__init(*args, **kwargs)
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Properties:
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- Something that looks to the outside user as an attribute,
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but internally it is something
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"_x" : private attribute, external users not suppose to be using it
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class C(object)
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- What is up with the "@" symbols?
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- Special syntax for wrapping a function with a function
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- Those are decorators, it's a syntax for wrapping functions up with
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- something special.
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ex:
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@property
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def x(self):
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# means make a property called x with a getter
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- NOTE: when you define a property you should define a getter
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- You DO NOT need to define a setter. If you don't you
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- get a read-only attribute
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EXAMPLE CODE FORE PROPERTY
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"""
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Example code for properties
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"""
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class C(object):
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_x = None
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@property
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def x(self):
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return self._x # returns c
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@x.setter
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def x(self, value):
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self._x = value
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@x.deleter
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def x(self):
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del self._x
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if __name__ == "__main__":
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c = C()
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c.x = 5
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print c.x
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## Static Methods
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A static method is a method that doesn't get self:
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class StaticAdder(object):
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@staticmethod
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def add(a,b);
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return a + b
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>> StaticAdder.add(3,6)
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Note: when you run "type()" and get 'type'...it is basically saying it is a class
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Note: For circle assignment use **2 = ^2
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## Protocols
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The set of special methods needed to emulate a particular type
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of Python object is called a protocol
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Your classes can "become" like a pre-existing python module
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