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deb-python-positional
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Initial commit of the positional decorator for the positional
pypi package.
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Morgan Fainberg 2016-01-12 21:04:47 -08:00
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Copyright (c) 2009 Jacob Kaplan-Moss - initial codebase (< v2.1)
Copyright (c) 2011 Rackspace - OpenStack extensions (>= v2.1)
Copyright (c) 2011 Nebula, Inc - Keystone refactor (>= v2.7)
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TOOD: Add Data Here.

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positional/__init__.py Normal file
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import functools
import inspect
import logging
_logger = logging.getLogger(__name__)
class positional(object):
"""A decorator which enforces only some args may be passed positionally.
This idea and some of the code was taken from the oauth2 client of the
google-api client.
This decorator makes it easy to support Python 3 style key-word only
parameters. For example, in Python 3 it is possible to write::
def fn(pos1, *, kwonly1, kwonly2=None):
...
All named parameters after * must be a keyword::
fn(10, 'kw1', 'kw2') # Raises exception.
fn(10, kwonly1='kw1', kwonly2='kw2') # Ok.
To replicate this behaviour with the positional decorator you simply
specify how many arguments may be passed positionally. To replicate the
example above::
@positional(1)
def fn(pos1, kwonly1=None, kwonly2=None):
...
If no default value is provided to a keyword argument, it becomes a
required keyword argument::
@positional(0)
def fn(required_kw):
...
This must be called with the keyword parameter::
fn() # Raises exception.
fn(10) # Raises exception.
fn(required_kw=10) # Ok.
When defining instance or class methods always remember that in python the
first positional argument passed is always the instance so you will need to
account for `self` and `cls`::
class MyClass(object):
@positional(2)
def my_method(self, pos1, kwonly1=None):
...
@classmethod
@positional(2)
def my_method(cls, pos1, kwonly1=None):
...
If you would prefer not to account for `self` and `cls` you can use the
`method` and `classmethod` helpers which do not consider the initial
positional argument. So the following class is exactly the same as the one
above::
class MyClass(object):
@positional.method(1)
def my_method(self, pos1, kwonly1=None):
...
@positional.classmethod(1)
def my_method(cls, pos1, kwonly1=None):
...
If a value isn't provided to the decorator then it will enforce that
every variable without a default value will be required to be a kwarg::
@positional()
def fn(pos1, kwonly1=None):
...
fn(10) # Ok.
fn(10, 20) # Raises exception.
fn(10, kwonly1=20) # Ok.
This behaviour will work with the `positional.method` and
`positional.classmethod` helper functions as well::
class MyClass(object):
@positional.classmethod()
def my_method(cls, pos1, kwonly1=None):
...
MyClass.my_method(10) # Ok.
MyClass.my_method(10, 20) # Raises exception.
MyClass.my_method(10, kwonly1=20) # Ok.
For compatibility reasons you may wish to not always raise an exception so
a WARN mode is available. Rather than raise an exception a warning message
will be logged::
@positional(1, enforcement=positional.WARN):
def fn(pos1, kwonly=1):
...
Available modes are:
- positional.EXCEPT - the default, raise an exception.
- positional.WARN - log a warning on mistake.
"""
EXCEPT = 'except'
WARN = 'warn'
def __init__(self, max_positional_args=None, enforcement=EXCEPT):
self._max_positional_args = max_positional_args
self._enforcement = enforcement
@classmethod
def method(cls, max_positional_args=None, enforcement=EXCEPT):
if max_positional_args is not None:
max_positional_args += 1
def f(func):
return cls(max_positional_args, enforcement)(func)
return f
@classmethod
def classmethod(cls, *args, **kwargs):
def f(func):
return classmethod(cls.method(*args, **kwargs)(func))
return f
def __call__(self, func):
if self._max_positional_args is None:
spec = inspect.getargspec(func)
self._max_positional_args = len(spec.args) - len(spec.defaults)
plural = '' if self._max_positional_args == 1 else 's'
@functools.wraps(func)
def inner(*args, **kwargs):
if len(args) > self._max_positional_args:
message = ('%(name)s takes at most %(max)d positional '
'argument%(plural)s (%(given)d given)' %
{'name': func.__name__,
'max': self._max_positional_args,
'given': len(args),
'plural': plural})
if self._enforcement == self.EXCEPT:
raise TypeError(message)
elif self._enforcement == self.WARN:
_logger.warning(message)
return func(*args, **kwargs)
return inner

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[metadata]
name = positional
summary = Library to enforce positional or key-word arguments
description-file =
README.rst
author = Morgan Fainberg
author-email = morgan.fainberg@gmail.com
home-page = https://github.com/morganfainberg/positional
classifier =
Intended Audience :: Developers
License :: OSI Approved :: Apache Software License
Operating System :: POSIX :: Linux
Programming Language :: Python
Programming Language :: Python :: 2
Programming Language :: Python :: 2.7
Programming Language :: Python :: 3
Programming Language :: Python :: 3.4
[files]
packages =
positional
[pbr]
warnerrors = True
autodoc_tree_index_modules = True
autodoc_tree_excludes =
setup.py
positional/tests/
[wheel]
universal = 1

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# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
import setuptools
# In python < 2.7.4, a lazy loading of package `pbr` will break
# setuptools if some other modules registered functions in `atexit`.
# solution from: http://bugs.python.org/issue15881#msg170215
try:
import multiprocessing # noqa
except ImportError:
pass
setuptools.setup(
setup_requires=['pbr>=1.8'],
pbr=True)