`Prototype` Module¶

This module contains the Prototype that can be used to create inheritance on object level instead of class level.

class knittingpattern.Prototype.Prototype(specification, inherited_values=())[source]¶

This class provides inheritance of its specifications on object level.

Throughout this class specification key refers to a hashable object to look up a value in the specification.

__contains__(key)[source]¶

key in prototype

Parameters:	key¶ – a specification key
Returns:	whether the key was found in the specification
Return type:	bool

__getitem__(key)[source]¶

prototype[key]

Parameters:	key¶ – a specification key
Returns:	the value behind `key` in the specification
Raises:	KeyError – if no value was found

__init__(specification, inherited_values=())[source]¶

create a new prototype

Parameters:	specification¶ – the specification of the prototype. This specification can be inherited by other prototypes. It can be a `dict` or an other `knittingpattern.Prototype.Prototype` or anything else that supports `__contains__()` and `__getitem__()`

To look up a key in the specification it will be walked through

However, new lookups can be inserted at before inherited_values, by calling inherit_from().

get(key, default=None)[source]¶

Returns:	the value behind `key` in the specification. If no value was found, `default` is returned.
Parameters:	key¶ – a specification key

inherit_from(new_specification)[source]¶

Inherit from a new_specification

Parameters:	new_specification¶ – a specification as passed to `__init__()`

The new_specification is inserted before the first inherited value.

If the order is

after calling prototype.inherit_from(new_specification) the lookup order is

Prototype Module¶