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tri.named-struct supplies a class that can be used like dictionaries (or via attribute access), but with a predefined set of possible key values

Project Description

tri.named_struct

tri.named_struct supplies classes that can be used like dictionaries, but with a predefined set of possible key values.

Example

from tri.named_struct import NamedStruct

class MyNamedStruct(NamedStruct):
    foo = NamedStructField()
    bar = NamedStructField()

m = MyNamedStruct(17, 42)
assert m['foo'] == 17
assert m.foo == 17
assert m == dict(foo=17, bar=42)

m.not_foo  # Will raise an AttributeError

Default values can be provided:

from tri.named_struct import NamedStruct

class MyNamedStruct(NamedStruct):
    foo = NamedStructField()
    bar = NamedStructField()
    baz = NamedStructField(default='default')

assert MyNamedStruct(17) == dict(foo=17, bar=None, baz='default')

Default values can alternatively be provided by a factory method:

from tri.named_struct import NamedStruct

class MyNamedStruct(NamedStruct):
    foo = NamedStructField(default_factory=list)

assert MyNamedStruct().foo == []

There is also a functional way to defined a NamedStruct subclass:

from tri.named_struct import named_struct

MyNamedStruct = named_struct('foo, bar')
m = MyNamedStruct(17, 42)
assert m.foo == 17
assert m.bar == 42

Running tests

You need tox installed then just make test.

License

BSD

Changelog

0.12.0 (2016-08-30)

  • Fix class level override of named struct fields.

0.11.0 (2016-05-06)

  • Fix deafult values shadowing values set explicitly in subclass __init__ method.

0.10.0 (2016-01-12)

  • Added default_factory argument to specify default values via a callback.
Release History

Release History

This version
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0.12.0

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0.11.0

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0.10.0

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0.9.0

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0.8.0

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0.6.0

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0.5.0

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0.4.0

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0.3.0

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
tri.named-struct-0.12.0.tar.gz (5.6 kB) Copy SHA256 Checksum SHA256 Source Oct 26, 2016

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