Work with XML documents as if they were Python objects
Project description
mappet
Mappet has been created to enable an easy an intuitive way to work with XML structures in Python code.
A well known lxml module has been used under the hood, mainly due to XML parsing performance.
Mappet accepts a string with valid XML, an lxml.etree._Element object or a dict representing the XML tree.
>>> import mappet
>>> f = open('example.xml', 'r')
>>> m = mappet.Mappet(f.read())
As an example, an XML document of the following structure has been used:
<?xml version='1.0' encoding='iso-8859-2'?>
<a-message>
<head>
<id seq="20" tstamp="2015-07-13T10:55:25+02:00"/>
<initiator>Mr Sender</initiator>
<date>2015-07-13T10:56:05.597420+02:00</date>
<type>reply-type</type>
</head>
<auth>
<user first-name="Name" last-name="LastName">id</user>
</auth>
<status>
<result>OK</result>
</status>
<reply>
<cars>
<Car>
<id>12345</id>
<Manufacturer>BMW</Manufacturer>
<Model_Name>X6</Model_Name>
<Body>SUV</Body>
<Fuel>Diesel</Fuel>
<Doors>5</Doors>
<ccm>3000</ccm>
<HP>256</HP>
<TransType>Automatic</TransType>
<seats>5</seats>
<weight>3690</weight>
</Car>
<Car>
<id>54321</id>
<Manufacturer>BMW</Manufacturer>
<Model_Name>X1</Model_Name>
<Body>SUV</Body>
<Fuel>Diesel</Fuel>
<Doors>5</Doors>
<ccm>3000</ccm>
<HP>198</HP>
<TransType>Automatic</TransType>
<seats>5</seats>
<weight>2890</weight>
</Car>
</cars>
</reply>
</a-message>Conventions
Every XML node can be accessed in two ways: by attribute and item access.
Dictionary access:
Dictionary access is possible thanks to XML document being represented as a Python dictionary. Conversion of values is done explicitly.
By default, values are returned as str.
>>> m['reply']['cars']['Car'][0]['Manufacturer'] 'BMW'
Nodes’ names are case-sensitive.
Attribute access:
Due to restrictions in Python variable names, tag names are normalized for attribute access. Tag names are normalized to lowercase and hyphens to underlines.
Same example using attribute access (__repr__ is responsible for representing the tag):
>>> m.reply.cars.car[0].manufacturer BMW
To get a string representation use get().
>>> m.reply.cars.car[0].manufacturer.get() 'BMW'
get() has two parameters, default and callback. The first one is returned when then node’s value is empty, the second is a function to be called upon the returned value.
>>> m.reply.cars.car[0].ccm.get(callback=int) 3000
Alternatively, one can use built-in helper functions, defined in helpers.py
>>> m.reply.cars.car[0].ccm.to_int() 3000
Helper functions
to_bool
to_int
to_str
to_string
to_float
to_time
to_datetime
to_date
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