A simple and dirty way to define generic methods to existing types.
Project description
It provides a simple and dirty way to define generic methods to existing types. You can make overloaded methods using this.
Compatibility
TypeQuery does not depend on any non-standard libraries. It works on these environments:
Python 2.5–2.7, 3.2–3.5
CPython, Stackless, PyPy, Jython
Install
Install using pip:
$ pip install TypeQuery
Example: JSON encoder
from typequery import GenericMethod from sys import version_info from re import sub from numbers import Real from collections import Mapping, Iterable if version_info.major > 2: basestring = string = str else: string = unicode json = GenericMethod('json') @json.of(type(None)) def json(value): return 'null' @json.of(bool) def json(value): return 'true' if value else 'false' @json.of(Real) def json(value): return str(value) @json.of(string) def json(value): def escape(match): s = match.group(0) if s in ('\\', '"', '\b', '\f', '\n', '\r', '\t'): return '\\' + s n = ord(s) if n < 0x10000: return r'\u%04x' % n n -= 0x10000 s1 = 0xd800 | ((n >> 10) & 0x3ff) s2 = 0xdc00 | (n & 0x3ff) return r'\u%04x\u%04x' % (s1, s2) return '"%s"' % sub(r'([\\"]|[^\ -~])', escape, value) @json.of(Iterable) def json(value): return '[%s]' % ', '.join(json(element) for element in value) @json.of(Mapping) def json(value): return '{%s}' % ', '.join('%s: %s' % (json(string(key)), json(value)) for key, value in value.items())
And defined json function works like:
>>> json(123) '123' >>> json(True) 'true' >>> json({'apple': 3, 'banana': 5, 'carrot': 1}) '{"apple": 3, "banana": 5, "carrot": 1}'
As the above shows, you can define type-aware instance methods to existing types even including ABCs like collections.Iterable.
Changelog
Version 0.1.5
Released on June 23, 2016.
Compatibility with recent Python versions: Python 3.3 to 3.5, and PyPy3.
Version 0.1.4
Released on October 18, 2012.
Don’t use bitbucket-distutils anymore to prevent several headaches related packaging and distribution.
Version 0.1.3
Released on August 29, 2012.
Fixed a bug of handling multiple types by one function. [#2]
Version 0.1.2
Released on August 15, 2012.
You can inherit existing generic methods using GenericMethod.inherit() method.
Added with_receiver option for GenericMethod.of() decorator and Decorator constructor.
Version 0.1.1
Released on May 22, 2012.
Now it works well with abstract base classes other than abc.ABCMeta.
Fixed a bug of GenericMethod.clone() method. It does not reflect cloned one’s changes to the original anymore. [#1]
Version 0.1.0
Released on May 21, 2012.
Initial release.
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