Card Me

Card Me simplifies the process of parsing and creating iCalendar and vCard objects. It is a fork of the venerable vobject library, improved, updated, substantially rewritten for Python3 support, and with some proper unit tests.

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Installation

Requires dateutil 2.4.0: pip install dateutil six should also be installed, if it isn't already: pip install six

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Running tests

To run unit tests, use python tests.py from within the card_me directory.

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Usage

Creating iCalendar objects

Card Me has a basic datastructure for working with iCalendar-like syntaxes. Additionally, it defines specialized behaviors for many of the commonly used iCalendar objects.

To create an object that already has a behavior defined, run:

>>> import card_me
>>> cal = card_me.newFromBehavior('vcalendar')
>>> cal.behavior
<class 'card_me.icalendar.VCalendar2_0'>

Convenience functions exist to create iCalendar and vCard objects:

>>> cal = card_me.iCalendar()
>>> cal.behavior
<class 'card_me.icalendar.VCalendar2_0'>
>>> card = card_me.vCard()
>>> card.behavior
<class 'card_me.vcard.VCard3_0'>

Once you have an object, you can use the add method to create children:

>>> cal.add('vevent')
<VEVENT| []>
>>> cal.vevent.add('summary').value = "This is a note"
>>> cal.prettyPrint()
 VCALENDAR
    VEVENT
       SUMMARY: This is a note

Note that summary is a little different from vevent, it's a ContentLine, not a Component.
It can't have children, and it has a special value attribute.

ContentLines can also have parameters. They can be accessed with regular attribute names with _param appended:

>>> cal.vevent.summary.x_random_param = 'Random parameter'
>>> cal.prettyPrint()
 VCALENDAR
    VEVENT
       SUMMARY: This is a note
       params for  SUMMARY:
          X-RANDOM ['Random parameter']

There are a few things to note about this example

• The underscore in x_random is converted to a dash (dashes are legal in iCalendar, underscores legal in Python)
• X-RANDOM's value is a list.

If you want to access the full list of parameters, not just the first, use _paramlist:

>>> cal.vevent.summary.x_random_paramlist
['Random parameter']
>>> cal.vevent.summary.x_random_paramlist.append('Other param')
>>> cal.vevent.summary
<SUMMARY{'X-RANDOM': ['Random parameter', 'Other param']}This is a note>

Similar to parameters, If you want to access more than just the first child of a Component, you can access the full list of children of a given name by appending _list to the attribute name:

>>> cal.add('vevent').add('summary').value = "Second VEVENT"
>>> for ev in cal.vevent_list:
...     print(ev.summary.value)
This is a note
Second VEVENT

The interaction between the del operator and the hiding of the underlying list is a little tricky, del cal.vevent and del cal.vevent_list both delete all vevent children:

>>> first_ev = cal.vevent
>>> del cal.vevent
>>> cal
<VCALENDAR| []>
>>> cal.vevent = first_ev

card_me understands Python's datetime module and tzinfo classes.

>>> import datetime
>>> utc = card_me.icalendar.utc
>>> start = cal.vevent.add('dtstart')
>>> start.value = datetime.datetime(2006, 2, 16, tzinfo = utc)
>>> first_ev.prettyPrint()
     VEVENT
        DTSTART: 2006-02-16 00:00:00+00:00
        SUMMARY: This is a note
        params for  SUMMARY:
           X-RANDOM ['Random parameter', 'Other param']

Components and ContentLines have serialize methods:

>>> cal.vevent.add('uid').value = 'Sample UID'
>>> icalstream = cal.serialize()
>>> print(icalstream)
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//PYVOBJECT//NONSGML Version 1//EN
BEGIN:VEVENT
UID:Sample UID
DTSTART:20060216T000000Z
SUMMARY;X-RANDOM=Random parameter,Other param:This is a note
END:VEVENT
END:VCALENDAR

Observe that serializing adds missing required lines like version and prodid. A random UID would be generated, too, if one didn't exist.

If dtstart's tzinfo had been something other than UTC, an appropriate vtimezone would be created for it.

Parsing iCalendar objects

To parse one top level component from an existing iCalendar stream or string, use the readOne function:

>>> parsedCal = card_me.readOne(icalstream)
>>> parsedCal.vevent.dtstart.value
datetime.datetime(2006, 2, 16, 0, 0, tzinfo=tzutc())

Similarly, readComponents is a generator yielding one top level component at a time from a stream or string.

>>> card_me.readComponents(icalstream).next().vevent.dtstart.value
datetime.datetime(2006, 2, 16, 0, 0, tzinfo=tzutc())

More examples can be found in source code doctests.

vCards

Making vCards proceeds in much the same way. Note that the 'N' and 'FN' attributes are required.

>>> j = card_me.vCard()
>>> j.add('n')
 <N{}    >
>>> j.n.value = card_me.vcard.Name( family='Smith', given='Tom' )
>>> j.add('fn')
 <FN{}>
>>> j.fn.value ='Tom Smith'
>>> j.add('email')
 <EMAIL{}>
>>> j.email.value = 'tom.smith@example.com'
>>> j.email.type_param = 'INTERNET'
>>> j.prettyPrint()
 VCARD
    EMAIL: tom.smith@example.com
    params for  EMAIL:
       TYPE ['INTERNET']
    FN: Tom Smith
    N:  Tom Smith

serializing will add any required computable attributes (like 'VERSION')

>>> j.serialize()
'BEGIN:VCARD\r\nVERSION:3.0\r\nEMAIL;TYPE=INTERNET:tom.smith@example.com\r\nFN:Tom Smith\r\nN:Smith;Tom;;;\r\nEND:VCARD\r\n'
>>> j.prettyPrint()
 VCARD
    VERSION: 3.0
    EMAIL: tom.smith@example.com
    params for  EMAIL:
       TYPE ['INTERNET']
    FN: Tom Smith
    N:  Tom Smith

Parsing vCards

>>> s = """
... BEGIN:VCARD
... VERSION:3.0
... EMAIL;TYPE=INTERNET:tom.smith@example.com
... FN:Tom Smith
... N:Smith;Tom;;;
... END:VCARD
... """
>>> v = card_me.readOne( s )
>>> v.prettyPrint()
 VCARD
    VERSION: 3.0
    EMAIL: tom.smith@example.com
    params for  EMAIL:
       TYPE [u'INTERNET']
    FN: Tom Smith
    N:  Tom Smith
>>> v.n.value.family
u'Smith'