Code cleanups
This commit is contained in:
Raymond Hettinger
parent
1eda5c9a83
commit
491f7070f1
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@ -601,47 +601,49 @@ Example:
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>>> Point = namedtuple('Point', ['x', 'y'], verbose=True)
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class Point(tuple):
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'Point(x, y)'
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'Point(x, y)'
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<BLANKLINE>
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__slots__ = ()
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__slots__ = ()
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<BLANKLINE>
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_fields = ('x', 'y')
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_fields = ('x', 'y')
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<BLANKLINE>
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def __new__(_cls, x, y):
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'Create a new instance of Point(x, y)'
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return _tuple.__new__(_cls, (x, y))
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def __new__(_cls, x, y):
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'Create a new instance of Point(x, y)'
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return _tuple.__new__(_cls, (x, y))
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<BLANKLINE>
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@classmethod
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def _make(cls, iterable, new=tuple.__new__, len=len):
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'Make a new Point object from a sequence or iterable'
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result = new(cls, iterable)
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if len(result) != 2:
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raise TypeError('Expected 2 arguments, got %d' % len(result))
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return result
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@classmethod
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def _make(cls, iterable, new=tuple.__new__, len=len):
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'Make a new Point object from a sequence or iterable'
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result = new(cls, iterable)
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if len(result) != 2:
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raise TypeError('Expected 2 arguments, got %d' % len(result))
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return result
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<BLANKLINE>
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def __repr__(self):
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'Return a nicely formatted representation string'
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return 'Point(x=%r, y=%r)' % self
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def __repr__(self):
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'Return a nicely formatted representation string'
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return 'Point(x=%r, y=%r)' % self
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<BLANKLINE>
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def _asdict(self):
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'Return a new OrderedDict which maps field names to their values'
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return OrderedDict(zip(self._fields, self))
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def _asdict(self):
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'Return a new OrderedDict which maps field names to their values'
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return OrderedDict(zip(self._fields, self))
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<BLANKLINE>
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__dict__ = property(_asdict)
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__dict__ = property(_asdict)
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<BLANKLINE>
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def _replace(_self, **kwds):
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'Return a new Point object replacing specified fields with new values'
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result = _self._make(map(kwds.pop, ('x', 'y'), _self))
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if kwds:
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raise ValueError('Got unexpected field names: %r' % kwds.keys())
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return result
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def _replace(_self, **kwds):
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'Return a new Point object replacing specified fields with new values'
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result = _self._make(map(kwds.pop, ('x', 'y'), _self))
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if kwds:
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raise ValueError('Got unexpected field names: %r' % kwds.keys())
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return result
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<BLANKLINE>
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def __getnewargs__(self):
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'Return self as a plain tuple. Used by copy and pickle.'
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return tuple(self)
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def __getnewargs__(self):
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'Return self as a plain tuple. Used by copy and pickle.'
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return tuple(self)
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<BLANKLINE>
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x = _property(_itemgetter(0), doc='Alias for field number 0')
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<BLANKLINE>
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y = _property(_itemgetter(1), doc='Alias for field number 1')
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<BLANKLINE>
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x = _property(_itemgetter(0), doc='Alias for field number 0')
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y = _property(_itemgetter(1), doc='Alias for field number 1')
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>>> p = Point(11, y=22) # instantiate with positional or keyword arguments
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>>> p[0] + p[1] # indexable like the plain tuple (11, 22)
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@ -234,10 +234,60 @@ class OrderedDict(dict):
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### namedtuple
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################################################################################
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_class_template = '''\
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class {typename}(tuple):
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'{typename}({arg_list})'
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__slots__ = ()
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_fields = {field_names!r}
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def __new__(_cls, {arg_list}):
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'Create new instance of {typename}({arg_list})'
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return _tuple.__new__(_cls, ({arg_list}))
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@classmethod
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def _make(cls, iterable, new=tuple.__new__, len=len):
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'Make a new {typename} object from a sequence or iterable'
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result = new(cls, iterable)
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if len(result) != {num_fields:d}:
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raise TypeError('Expected {num_fields:d} arguments, got %d' % len(result))
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return result
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def __repr__(self):
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'Return a nicely formatted representation string'
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return '{typename}({repr_fmt})' % self
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def _asdict(self):
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'Return a new OrderedDict which maps field names to their values'
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return OrderedDict(zip(self._fields, self))
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__dict__ = property(_asdict)
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def _replace(_self, **kwds):
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'Return a new {typename} object replacing specified fields with new values'
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result = _self._make(map(kwds.pop, {field_names!r}, _self))
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if kwds:
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raise ValueError('Got unexpected field names: %r' % kwds.keys())
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return result
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def __getnewargs__(self):
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'Return self as a plain tuple. Used by copy and pickle.'
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return tuple(self)
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{field_defs}
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'''
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_repr_template = '{name}=%r'
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_field_template = '''\
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{name} = _property(_itemgetter({index:d}), doc='Alias for field number {index:d}')
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'''
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def namedtuple(typename, field_names, verbose=False, rename=False):
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"""Returns a new subclass of tuple with named fields.
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>>> Point = namedtuple('Point', 'x y')
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>>> Point = namedtuple('Point', ['x', 'y'])
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>>> Point.__doc__ # docstring for the new class
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'Point(x, y)'
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>>> p = Point(11, y=22) # instantiate with positional args or keywords
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@ -267,8 +317,11 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
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names = list(field_names)
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seen = set()
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for i, name in enumerate(names):
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if (not all(c.isalnum() or c=='_' for c in name) or _iskeyword(name)
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or not name or name[0].isdigit() or name.startswith('_')
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if (not all(c.isalnum() or c=='_' for c in name)
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or _iskeyword(name)
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or not name
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or name[0].isdigit()
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or name.startswith('_')
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or name in seen):
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names[i] = '_%d' % i
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seen.add(name)
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@ -280,60 +333,34 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
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raise ValueError('Type names and field names cannot be a keyword: %r' % name)
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if name[0].isdigit():
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raise ValueError('Type names and field names cannot start with a number: %r' % name)
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seen_names = set()
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seen = set()
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for name in field_names:
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if name.startswith('_') and not rename:
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raise ValueError('Field names cannot start with an underscore: %r' % name)
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if name in seen_names:
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if name in seen:
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raise ValueError('Encountered duplicate field name: %r' % name)
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seen_names.add(name)
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seen.add(name)
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# Create and fill-in the class template
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numfields = len(field_names)
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argtxt = repr(field_names).replace("'", "")[1:-1] # tuple repr without parens or quotes
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reprtxt = ', '.join('%s=%%r' % name for name in field_names)
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template = '''class %(typename)s(tuple):
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'%(typename)s(%(argtxt)s)' \n
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__slots__ = () \n
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_fields = %(field_names)r \n
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def __new__(_cls, %(argtxt)s):
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'Create new instance of %(typename)s(%(argtxt)s)'
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return _tuple.__new__(_cls, (%(argtxt)s)) \n
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@classmethod
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def _make(cls, iterable, new=tuple.__new__, len=len):
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'Make a new %(typename)s object from a sequence or iterable'
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result = new(cls, iterable)
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if len(result) != %(numfields)d:
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raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
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return result \n
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def __repr__(self):
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'Return a nicely formatted representation string'
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return '%(typename)s(%(reprtxt)s)' %% self \n
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def _asdict(self):
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'Return a new OrderedDict which maps field names to their values'
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return OrderedDict(zip(self._fields, self)) \n
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__dict__ = property(_asdict) \n
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def _replace(_self, **kwds):
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'Return a new %(typename)s object replacing specified fields with new values'
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result = _self._make(map(kwds.pop, %(field_names)r, _self))
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if kwds:
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raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
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return result \n
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def __getnewargs__(self):
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'Return self as a plain tuple. Used by copy and pickle.'
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return tuple(self) \n\n''' % locals()
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for i, name in enumerate(field_names):
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template += " %s = _property(_itemgetter(%d), doc='Alias for field number %d')\n" % (name, i, i)
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# Fill-in the class template
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class_definition = _class_template.format(
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typename = typename,
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field_names = tuple(field_names),
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num_fields = len(field_names),
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arg_list = repr(tuple(field_names)).replace("'", "")[1:-1],
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repr_fmt = ', '.join(_repr_template.format(name=name) for name in field_names),
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field_defs = '\n'.join(_field_template.format(index=index, name=name)
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for index, name in enumerate(field_names))
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)
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if verbose:
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print template
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print class_definition
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# Execute the template string in a temporary namespace and
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# support tracing utilities by setting a value for frame.f_globals['__name__']
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namespace = dict(_itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
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OrderedDict=OrderedDict, _property=property, _tuple=tuple)
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try:
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exec template in namespace
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except SyntaxError, e:
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exec class_definition in namespace
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except SyntaxError as e:
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raise SyntaxError(e.message + ':\n' + template)
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result = namespace[typename]
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