duplicated方法和drop_droplicates方法作用相同。
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python中,以下那个不是比较运算符____
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NumPy的np.sort函数效率低于Python的sort函数。
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SQL的聚集函数COUNT、SUM、MIN、MAX、AVG不允许出现在查询语句的____
子句中
A. SELECT
B. HAVING
C. GROUP BY
D. WHERE
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数据分析挖掘平台Woody中允许上传文件。
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在mole中,若当前节点的状态为running,则节点的下一状态可能为____
A. finished
B. dirty
C. start
D. error
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对公集市的模型分为____
A. 缓冲层
B. 中间层
C. 应用层
D. 基础层
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集成学习研究的核心是如何产生并结合“好而不同”的个体学习器。
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以下SQL语句正确的有____
A. SELECT
cust_name FROM
Customers WHERE
cust_state IN
('IL','IN','MI'
) UNION SELECT
cust_name FROM
Customers WHERE
cust_name =
'Fun4All';
B. SELECT
cust_name FROM
Customers WHERE
cust_state IN
('IL','IN','MI'
) UNION SELECT
cust_contact
FROM Customers
WHERE cust_name
= 'Fun4All';
C. SELECT * FROM
Customers WHERE
cust_state IN
('IL','IN','MI'
) UNION SELECT
* FROM
Customers WHERE
cust_name =
'Fun4All';
D. SELECT * FROM
Customers WHERE
cust_state IN
('IL','IN','MI'
) UNION SELECT
cust_name FROM
Customers WHERE
cust_name =
'Fun4All';
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假设x=np.array([1,2,3,4,5]),那么x<3等于?
A. array([1,2])
B. array([True,Tru
e,False,False,F
alse])
C. FALSE
D. TRUE
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