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真实世界实体 视频

Java 程序员备注：

Wolfram 语言中的实体结合了自然语言处理、高级数据语义和知识库访问，以特有的方式统一真实世界实体表示，从而创建了全新的编程流程.

Python 程序员备注：

Wolfram 语言中的实体结合了自然语言处理，高级数据语义和知识库访问，以特有的方式统一真实世界实体表示. 运用紧密集成的笔记本系统的同时，Wolfram 语言实体实现了全新和表性类型的编程流程，这在 Python 中无法快速实现. Python 用 Wolfram 客户端库能够用 Python 代码直接计算和操作 Wolfram 语言实体.

在 Wolfram 语言中，真实世界实体只是另一种符号表达式.

Wolfram 语言知道数千种真实世界实体：

使用自然语言指定实体很方便：

In[1]:=1
los angeles
Out[1]=1

实体有很多属性. 这是其中的一个值：

In[2]:=2
EntityValue[Entity["City", {"LosAngeles", "California", "UnitedStates"}], "Population"]
Out[2]=2

用 entity["Properties"] 找到属性列表.

当输入自然语言时， 用于消除歧义：

In[1]:=1
los angeles

表示一个实体类：

In[1]:=1
EntityList[EntityClass["Country", "GermanSpeaking"]]
Out[1]=1

使用 ctrl+= 输入单位和度量：

In[1]:=1
3 meters
Out[1]=1

InputForm 显示符号表达式的结构：

In[2]:=2
InputForm[%]
Out[2]=2

GeoPosition 代表一个地理位置：

In[1]:=1
GeoPosition[\!\(\* NamespaceBox["LinguisticAssistant", DynamicModuleBox[{WolframAlphaClient`Private`query$$ = "eiffel tower", WolframAlphaClient`Private`boxes$$ = TemplateBox[{"\"Eiffel Tower\"", RowBox[{"Entity", "[", RowBox[{"\"Building\"", ",", "\"TourEiffel\""}], "]"}], "\"Entity[\\\"Building\\\", \\\"TourEiffel\\\"]\"", "\"building\""}, "Entity"], WolframAlphaClient`Private`allassumptions$$ = {{ "type" -> "Clash", "word" -> "eiffel tower", "template" -> "Assuming \"${word}\" is ${desc1}. Use as \ ${desc2} instead", "count" -> "2", "Values" -> {{ "name" -> "Building", "desc" -> "a structure", "input" -> "*C.eiffel+tower-_*Building-"}, { "name" -> "Word", "desc" -> "a word", "input" -> "*C.eiffel+tower-_*Word-"}}}}, WolframAlphaClient`Private`assumptions$$ = {}, WolframAlphaClient`Private`open$$ = {1, 2}}, DynamicBox[ToBoxes[ AlphaIntegration`LinguisticAssistantBoxes["", 1, Dynamic[WolframAlphaClient`Private`query$$], Dynamic[WolframAlphaClient`Private`boxes$$], Dynamic[WolframAlphaClient`Private`allassumptions$$], Dynamic[WolframAlphaClient`Private`assumptions$$], Dynamic[WolframAlphaClient`Private`open$$]], StandardForm], ImageSizeCache->{183., {10., 18.}}, TrackedSymbols:>{ WolframAlphaClient`Private`query$$, WolframAlphaClient`Private`boxes$$, WolframAlphaClient`Private`allassumptions$$, WolframAlphaClient`Private`assumptions$$, WolframAlphaClient`Private`open$$}], DynamicModuleValues:>{}, UndoTrackedVariables:>{WolframAlphaClient`Private`open$$}], BaseStyle->{"Deploy"}, DeleteWithContents->True, Editable->False, SelectWithContents->True]\)]
Out[1]=1

In[2]:=2
GeoListPlot[{\!\(\* NamespaceBox["LinguisticAssistant", DynamicModuleBox[{WolframAlphaClient`Private`query$$ = "eiffel tower", WolframAlphaClient`Private`boxes$$ = TemplateBox[{"\"Eiffel Tower\"", RowBox[{"Entity", "[", RowBox[{"\"Building\"", ",", "\"TourEiffel\""}], "]"}], "\"Entity[\\\"Building\\\", \\\"TourEiffel\\\"]\"", "\"building\""}, "Entity"], WolframAlphaClient`Private`allassumptions$$ = {{ "type" -> "Clash", "word" -> "eiffel tower", "template" -> "Assuming \"${word}\" is ${desc1}. Use as \ ${desc2} instead", "count" -> "2", "Values" -> {{ "name" -> "Building", "desc" -> "a structure", "input" -> "*C.eiffel+tower-_*Building-"}, { "name" -> "Word", "desc" -> "a word", "input" -> "*C.eiffel+tower-_*Word-"}}}}, WolframAlphaClient`Private`assumptions$$ = {}, WolframAlphaClient`Private`open$$ = {1, 2}}, DynamicBox[ToBoxes[ AlphaIntegration`LinguisticAssistantBoxes["", 1, Dynamic[WolframAlphaClient`Private`query$$], Dynamic[WolframAlphaClient`Private`boxes$$], Dynamic[WolframAlphaClient`Private`allassumptions$$], Dynamic[WolframAlphaClient`Private`assumptions$$], Dynamic[WolframAlphaClient`Private`open$$]], StandardForm], ImageSizeCache->{183., {10., 18.}}, TrackedSymbols:>{ WolframAlphaClient`Private`query$$, WolframAlphaClient`Private`boxes$$, WolframAlphaClient`Private`allassumptions$$, WolframAlphaClient`Private`assumptions$$, WolframAlphaClient`Private`open$$}], DynamicModuleValues:>{}, UndoTrackedVariables:>{WolframAlphaClient`Private`open$$}], BaseStyle->{"Deploy"}, DeleteWithContents->True, Editable->False, SelectWithContents->True]\), \!\(\* NamespaceBox["LinguisticAssistant", DynamicModuleBox[{WolframAlphaClient`Private`query$$ = "Ayers Rock", WolframAlphaClient`Private`boxes$$ = TemplateBox[{"\"Uluru\"", RowBox[{"Entity", "[", RowBox[{"\"Mountain\"", ",", "\"Uluru\""}], "]"}], "\"Entity[\\\"Mountain\\\", \\\"Uluru\\\"]\"", "\"mountain\""}, "Entity"], WolframAlphaClient`Private`allassumptions$$ = {}, WolframAlphaClient`Private`assumptions$$ = {}, WolframAlphaClient`Private`open$$ = {1, 2}}, DynamicBox[ToBoxes[ AlphaIntegration`LinguisticAssistantBoxes["", 1, Dynamic[WolframAlphaClient`Private`query$$], Dynamic[WolframAlphaClient`Private`boxes$$], Dynamic[WolframAlphaClient`Private`allassumptions$$], Dynamic[WolframAlphaClient`Private`assumptions$$], Dynamic[WolframAlphaClient`Private`open$$]], StandardForm], ImageSizeCache->{130., {10., 18.}}, TrackedSymbols:>{ WolframAlphaClient`Private`query$$, WolframAlphaClient`Private`boxes$$, WolframAlphaClient`Private`allassumptions$$, WolframAlphaClient`Private`assumptions$$, WolframAlphaClient`Private`open$$}], DynamicModuleValues:>{}, UndoTrackedVariables:>{WolframAlphaClient`Private`open$$}], BaseStyle->{"Deploy"}, DeleteWithContents->True, Editable->False, SelectWithContents->True]\)}]
Out[2]=2

DateObject 代表日期/时间：

In[1]:=1
Sunset[Tomorrow]
Out[1]=1

In[2]:=2
InputForm[%]
Out[2]=2

Python 程序员备注：

DateObjects 是 Wolfram 语言的独特函数，可自动将导入或导出解析至其他环境中. 在 Python 中，虽然分别有程序库可以解析数据字符串，但需要手动分割或结合. 可通过 Python 用 Wolfram 客户端库用 Python 访问 DateObject。

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