Python2 - Revision history

Sstrutt: Added "XML"

2011-05-26T11:02:23Z

Added "XML"

← Older revision		Revision as of 11:02, 26 May 2011
Line 46:		Line 46:
	</source>		</source>

			== XML ==
			There are two branches of modules that enable handling of XML...
			* SAX - Simple API for XML
			* DOM - Document Object Model, which has a cut-down version known as...
			** MiniDOM

			=== MiniDOM ===
			Example of processing of an XML file...
			<source lang="python">
			from xml.dom.minidom import parseString

			# Read file in
			file = open('file.xml','r')
			data = file.read()
			file.close()

			# Parse file into dom object
			dom = parseString(data)

			# Extract XML root data
			name = dom.getElementsByTagName('name')[0].firstChild.data
			descrip = dom.getElementsByTagName('description')[0].firstChild.data


			# Extract XML header data
			header = dom.getElementsByTagName('Header')[0]
			identifier = header.getElementsByTagName('Identifier')[0].firstChild.data
			owner = header.getElementsByTagName('Owner')[0].firstChild.data


			# Extract XML events data
			events = dom.getElementsByTagName('roadrunner')[0].getElementsByTagName('rr_event')
			for event in events:
			ltisid = event.getElementsByTagName('ltisid')[0].firstChild.data
			title = event.getElementsByTagName('title')[0].firstChild.data
			</source>

			Example XML file (edited excerpt from a TfL feed, see the following of your interested - http://www.tfl.gov.uk/businessandpartners/syndication/)
			<source lang="xml">
			<?xml version="1.0" encoding="ISO-8859-1"?>
			<Root>
			<name>Transport for London Live Traffic Disruptions</name>
			<description>Transport for London LTIS (London Traffic Information System) Events</description>
			<Header>
			<Identifier>TfL \| Events</Identifier>
			<Owner>Transport for London</Owner>
			</Header>
			<roadrunner updatetime="2011-05-07T2151">
			<rr_event>
			<ltisid>203686</ltisid>
			<title>Piccadilly / A4 (West End)</title>
			</rr_event>
			<rr_event>
			<ltisid>206414</ltisid>
			<title>Marylebone Road / A501 (Regent's Park)</title>
			</rr_event>
			<rr_event>
			<ltisid>195734</ltisid>
			<title>Blackwall Tunnel (Both Bores) (Poplar)</title>
			</rr_event>
			</roadrunner>
			</Root>

			</source>
	[[Category:Python]]		[[Category:Python]]

Sstrutt: /* Files */ Added additional examples

2011-05-23T08:58:25Z

Files: Added additional examples

← Older revision		Revision as of 08:58, 23 May 2011
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	data = file.read()		data = file.read()
	file.close()		file.close()

			# Write a line to a file
			log = open('test.log', 'w')
			log.write('some text, no carriage return at end')
			log.writelines('a line of text')
			log.close

	# Get directory listing and print with filesizes		# Get directory listing and print with filesizes
			import os
	files = os.listdir('dir')		files = os.listdir('dir')
	for fil in files:		for fil in files:
	print (fil + '\t' + str(os.path.getsize(os.path.join('dir', fil))))		print (fil + '\t' + str(os.path.getsize(os.path.join('dir', fil))))

			# Move file
			import shutil
			shutil.move('file', 'dir/file')
	</source>		</source>

	[[Category:Python]]		[[Category:Python]]

Sstrutt: Initial creation

2011-05-20T10:22:28Z

Initial creation

New page

== Getting Started ==
The main site for downloads, documentation etc, can be found at http://www.python.org.

=== Python2 or Python3 ===
The language is going through a metamorphosis from v2 to v3 and you'll have to choose which to go for. Essentially if you're starting from scratch then go for v3, but if you need to integrate with existing Python code or are a complete scripting/coding novice (and so need to be able to use the wealth of examples etc on the web) go for v2. See http://wiki.python.org/moin/Python2orPython3 for further info.

'''This page is for Python2'''

=== Install ===
Python often comes pre-installed on Linux systems such as Ubuntu, try firing up the command line environment by typing python. Otherwise you'll need to install from a repository (unix), or download and execute tyhe installer (windows).

== Variables ==
=== Variable Information ===
Get a variables available methods...
<source lang="python">
dir(variable)
</source>
=== Variable Conversion ===
<source lang="python">
int(var) # Convert to integer
str(var) # Convert to string
</source>

== Files ==
<source lang="python">
# Read contents of file
file = open('file.txt','r')
data = file.read()
file.close()

# Get directory listing and print with filesizes
files = os.listdir('dir')
for fil in files:
print (fil + '\t' + str(os.path.getsize(os.path.join('dir', fil))))

</source>
[[Category:Python]]