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<h1>
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<doc-anchor-trigger class="header-anchor-trigger" to="#dataclasses">#</doc-anchor-trigger>
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<span>dataclasses</span>
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<span><code translate="no" v-pre>dataclasses.dataclass</code></span>
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<p>A decorator that is used to add special method to classes, including <code translate="no" v-pre>__init__</code>, <code translate="no" v-pre>__repr__</code> and <code translate="no" v-pre>__eq__</code>.</p>
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<h3>
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<doc-anchor-trigger class="header-anchor-trigger" to="#dataclassesasdictobj---dict">#</doc-anchor-trigger>
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<span><code translate="no" v-pre>dataclasses.asdict(obj) -> dict</code></span>
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</h3>
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</doc-anchor-target>
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<p>Convert a dataclass instance to a dictionary.</p>
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-python"><code v-pre class="language-python">def _get_annotations(cls: type):
|
||
inherits = []
|
||
while cls is not object:
|
||
inherits.append(cls)
|
||
cls = cls.__base__
|
||
inherits.reverse()
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res = {}
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||
for cls in inherits:
|
||
res.update(cls.__annotations__)
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return res.keys()
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def _wrapped__init__(self, *args, **kwargs):
|
||
cls = type(self)
|
||
cls_d = cls.__dict__
|
||
fields = _get_annotations(cls)
|
||
i = 0 # index into args
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for field in fields:
|
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if field in kwargs:
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setattr(self, field, kwargs.pop(field))
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else:
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if i < len(args):
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setattr(self, field, args[i])
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i += 1
|
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elif field in cls_d: # has default value
|
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setattr(self, field, cls_d[field])
|
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else:
|
||
raise TypeError(f"{cls.__name__} missing required argument {field!r}")
|
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if len(args) > i:
|
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raise TypeError(f"{cls.__name__} takes {len(fields)} positional arguments but {len(args)} were given")
|
||
if len(kwargs) > 0:
|
||
raise TypeError(f"{cls.__name__} got an unexpected keyword argument {next(iter(kwargs))!r}")
|
||
|
||
def _wrapped__repr__(self):
|
||
fields = _get_annotations(type(self))
|
||
obj_d = self.__dict__
|
||
args: list = [f"{field}={obj_d[field]!r}" for field in fields]
|
||
return f"{type(self).__name__}({', '.join(args)})"
|
||
|
||
def _wrapped__eq__(self, other):
|
||
if type(self) is not type(other):
|
||
return False
|
||
fields = _get_annotations(type(self))
|
||
for field in fields:
|
||
if getattr(self, field) != getattr(other, field):
|
||
return False
|
||
return True
|
||
|
||
def _wrapped__ne__(self, other):
|
||
return not self.__eq__(other)
|
||
|
||
def dataclass(cls: type):
|
||
assert type(cls) is type
|
||
cls_d = cls.__dict__
|
||
if '__init__' not in cls_d:
|
||
cls.__init__ = _wrapped__init__
|
||
if '__repr__' not in cls_d:
|
||
cls.__repr__ = _wrapped__repr__
|
||
if '__eq__' not in cls_d:
|
||
cls.__eq__ = _wrapped__eq__
|
||
if '__ne__' not in cls_d:
|
||
cls.__ne__ = _wrapped__ne__
|
||
fields = _get_annotations(cls)
|
||
has_default = False
|
||
for field in fields:
|
||
if field in cls_d:
|
||
has_default = True
|
||
else:
|
||
if has_default:
|
||
raise TypeError(f"non-default argument {field!r} follows default argument")
|
||
return cls
|
||
|
||
def asdict(obj) -> dict:
|
||
fields = _get_annotations(type(obj))
|
||
obj_d = obj.__dict__
|
||
return {field: obj_d[field] for field in fields}</code></pre>
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</doc-codeblock></div>
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