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"""
Provides helper utilities.
"""
import sys
import copy
import string
import functools
def fix_unicode(cls):
"""
A class decorator that defines __unicode__, makes __str__ and __repr__
return a utf-8 encoded string and encodes unicode exception messages
to utf-8 encoded strings under Python 2. Does nothing under Python 3.
:param class cls: (required). A class where unicode should be fixed.
"""
if sys.version_info[0] >= 3:
return cls
def decorator(fn):
@functools.wraps(fn, assigned=('__name__', '__doc__'))
def wrapper(self, *args, **kwargs):
if fn.__name__ == '__init__':
return fn(self, *[arg.encode('utf-8') if isinstance(arg, unicode) else arg for arg in args], **kwargs)
return fn(self).encode('utf-8')
return wrapper
if issubclass(cls, Exception):
cls.__init__ = decorator(cls.__init__)
return cls
cls.__unicode__ = cls.__str__
cls.__str__ = decorator(cls.__unicode__)
cls.__repr__ = decorator(cls.__repr__)
return cls
def with_metaclass(meta, *bases):
"""
Create a base class with a metaclass.
"""
class MetaClass(meta):
def __new__(cls, name, this_bases, dct):
return meta(name, bases, dct)
return type.__new__(MetaClass, 'temporary_class', (), {})
def merge_dicts(a, b):
"""
Merges dicts a and b recursively into a new dict.
:param dict a: (required).
:param dict b: (required).
"""
result = copy.deepcopy(a)
for key, value in b.items():
if isinstance(value, dict):
result[key] = merge_dicts(value, a.get(key, {}))
else:
result[key] = value
return result
class MemorizeFormatter(string.Formatter):
"""
Memorizes all arguments, used during string formatting.
"""
def __init__(self):
self.used_kwargs = {}
self.unused_kwargs = {}
def check_unused_args(self, used_args, args, kwargs):
for item in used_args:
if item in kwargs:
self.used_kwargs[item] = kwargs.pop(item)
self.unused_kwargs = kwargs
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