WOLFRAM

Wolfram 语言与系统参考资料中心

ContainsOnly[list1,list2]

如果 list1 只包含出现在 list2 中的元素，则生成 True.

ContainsOnly[list2]

运算符形式，当被应用的对象只包含出现在 list2 中的元素时，生成 True.

更多信息和选项
Details and Options Details and Options
范例  
基本范例  
范围  
选项  
SameTest  
应用  
属性和关系  
参见
相关指南
历史
按以下格式引用：

ContainsOnly

ContainsOnly[list1,list2]

如果 list1 只包含出现在 list2 中的元素，则生成 True.

ContainsOnly[list2]

运算符形式，当被应用的对象只包含出现在 list2 中的元素时，生成 True.

更多信息和选项

范例

打开所有单元 关闭所有单元

基本范例  (2)

第一个列表只包含第二个列表中的元素：

Wolfram Language code: ContainsOnly[{b, a, a}, {a, b, c}]

第一个列表含有不在第二个列表中出现的元素：

Wolfram Language code: ContainsOnly[{b, a, d}, {a, b, c}]

范围  (4)

这是只含有元音的最长的英文单词之一：

Wolfram Language code: ContainsOnly[Characters["euouae"], {"a", "e", "i", "o", "u"}]

使用 ContainsOnly 的运算符形式：

Wolfram Language code: weekendonly = ContainsOnly[{Saturday, Sunday}]
Wolfram Language code: weekendonly[{Saturday, Saturday, Sunday}]
Wolfram Language code: weekendonly[{Friday, Saturday, Sunday}]

由约翰·列侬（John Lennon）或保罗·麦卡特尼（Paul McCartney）或两者共同创作的歌曲数目：

Wolfram Language code: EntityValue[EntityClass["MusicWork", {"Composers" -> ContainsOnly[{Entity["Person", "JohnLennon::cpwy3"], Entity["Person", "PaulMcCartney::8wk6t"]}]}], "EntityCount"]

ContainsOnly 适用于关联：

Wolfram Language code: ContainsOnly[<|a -> x, b -> y|>, {x, y, z}]
Wolfram Language code: ContainsOnly[<|a -> x, b -> y|>, <|1 -> x, 2 -> y, 3 -> z|>]

选项  (2)

SameTest  (2)

默认情况下，ContainsOnly 认为等同元素是相同的：

Wolfram Language code: list = Subdivide[Quantity[0, "Meters"], Quantity[1, "Meters"], 10]
Wolfram Language code: ContainsOnly[{Quantity[1/5, "Meters"], Quantity[1/2, "Meters"]}, list]

考虑单位的改变，只要它们表示的是完全相同的量：

Wolfram Language code: ContainsOnly[{Quantity[20, "Centimeters"], Quantity[50, "Centimeters"]}, list]

数值近似不被认为是相同的对象：

Wolfram Language code: ContainsOnly[{Quantity[20., "Centimeters"], Quantity[50., "Centimeters"]}, list]

使用 Equal 作为有数值公差的比较函数：

Wolfram Language code: ContainsOnly[{Quantity[20., "Centimeters"], Quantity[50., "Centimeters"]}, list, SameTest -> Equal]

字符串比较在默认情况下对大小写敏感：

Wolfram Language code: ContainsOnly[{"A", "B", "C"}, {"a", "b", "c"}]

在比较之前转换为小写形式：

Wolfram Language code: ContainsAny[{"A", "B", "C"}, {"a", "b", "c"}, SameTest -> (SameQ[ToLowerCase[#1], ToLowerCase[#2]]&)]

应用  (1)

取一段文本的字符，以小写形式：

Wolfram Language code: Length[characters = Characters[ToLowerCase[ExampleData[{"Text", "LoremIpsum"}, "String"]]]]

它们都是字母和基本的标点符号：

Wolfram Language code: ContainsOnly[characters, Join[CharacterRange["a", "z"], {" ", ".", ","}]]

属性和关系  (3)

逆转 ContainsOnly 的参数等价于使用 ContainsAll：

Wolfram Language code: list1 = {1, 2, 3, 4, 5};
Wolfram Language code: list2 = {4, 0, 4, 4, 1, 1, 3, 1, 5, 5};
Wolfram Language code: {ContainsOnly[list1, list2], ContainsAll[list2, list1]}

ContainsOnly[list1,list2] 等价于 SubsetQ[list2,list1]：

Wolfram Language code: list1 = {1, 2, 3, 4, 5};
Wolfram Language code: list2 = {1, 1, 1, 5, 5, 3, 4, 1, 0, 4};
Wolfram Language code: {ContainsOnly[list1, list2], SubsetQ[list2, list1]}

ContainsOnly[{},list] 总是返回 True：

Wolfram Language code: ContainsOnly[{}, {1, 2}]
Wolfram Language code: ContainsOnly[{}, {}]
Wolfram Research (2015)，ContainsOnly，Wolfram 语言函数，https://reference.wolfram.com/language/ref/ContainsOnly.html.

文本

Wolfram Research (2015)，ContainsOnly，Wolfram 语言函数，https://reference.wolfram.com/language/ref/ContainsOnly.html.

CMS

Wolfram 语言. 2015. "ContainsOnly." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/ContainsOnly.html.

APA

Wolfram 语言. (2015). ContainsOnly. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/ContainsOnly.html 年

BibTeX

@misc{reference.wolfram_2026_containsonly, author="Wolfram Research", title="{ContainsOnly}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/ContainsOnly.html}", note=[Accessed: 15-September-2026]}

BibLaTeX

@online{reference.wolfram_2026_containsonly, organization={Wolfram Research}, title={ContainsOnly}, year={2015}, url={https://reference.wolfram.com/language/ref/ContainsOnly.html}, note=[Accessed: 15-September-2026]}