Question

The nltk module is running with other libraries in the corpus folder.

我已经尝试过先将'import nltk'放入，但是还是一样，而且我也尝试了'from nltk.tokenize import'PunktSentenceTokenizer'。我不知道为什么Python shell无法找到nltk的定义。我该如何解决？我仍在学习如何编写和编码python。

Answer 1

您需要

# order dataframe on id and year
data <- data[order(data$id, data$year), ]
# get the max length of non-NA stretche in values column
max.rle <- tapply(!is.na(data$value), data$id, function(x) {
  max.vec <- rle(x)$length[rle(x)$values==T]
  ifelse(length(max.vec) > 0, max(max.vec), 0)
})
# remove those ids that has stretch length less than 5
data <- data[data$id %in% names(max.rle[max.rle >= 5]), ]
# print data
data

   id year     value
1   A 2008 116.57251
2   A 2009  92.22958
3   A 2010  68.67486
4   A 2011  86.67054
5   A 2012  85.74104
6   A 2013  83.21088
7   A 2014  97.20029
8   A 2015 127.53420
9   A 2016  86.97861
10  A 2017 119.10791
11  B 2008 105.26708
12  B 2009  72.47399
13  B 2010  85.00305
14  B 2011  93.80867
15  B 2012 113.37334
16  B 2013 116.63578
17  B 2014 119.41421
18  B 2015 108.64411
19  B 2016  73.80403
20  B 2017 143.75300

通过

安装软件包后

import nltk

Answer 2

您在文件中拼错了程序包的名称，而是使用//sample data insert into employee(id_user int,salary_date date,salary_value) values (3, 2017-06-28, 15) ( 5, 2017-06-26 5) ( 2, 2017-06-20 5) ( 1, 2017-06-20 15) ( 4, 2017-06-17 25) //expected output: id date sal newdate days aboveavgsal date current/firstsal 1 2017-06-20 15 2017-05-20 31 N 2017-04-20 0.6 1 2017-05-20 10 2017-04-20 30 N 2017-04-20 0.4 1 2017-04-20 20 2017-03-20 31 Y 2017-03-20 0.8 1 2017-03-20 20 2017-02-20 28 Y NULL 0.8 1 2017-02-20 15 NULL NULL N NULL 0.6 SELECT id_user , salary_date , salary_value , lead(salary_date) OVER(PARTITION BY id_user ORDER BY salary_date desc) , salary_date::timestamp - lead(salary_date::timestamp) over (PARTITION BY id_user ORDER BY salary_date DESC) , CASE WHEN salary_value >= 20 THEN 'Y' ELSE 'N' END , CASE WHEN salary_value >= 20 THEN lead(salary_date) OVER(PARTITION BY id_user ORDER BY salary_date DESC) END , (SELECT CAST(t1.salary_value AS float) / CAST(t.salary_value AS float) FROM ( SELECT t.id_user , t.salary_value , ROW_NUMBER() OVER(PARTITION BY t.id_user ORDER BY t.salary_date) AS rowrank FROM employee t ) AS t INNER JOIN employee AS t1 ON t1.id_user = t.id_user WHERE t.rowrank = 1 GROUP BY t1.id_user, t1.salary_value, t1.salary_date, t.salary_value, t.rowrank ORDER BY t1.id_user, t1.salary_date DESC ) AS fraction FROM employee Error starts in this query which i tried enclosing in braces. (SELECT CAST(t1.salary_value AS float) / CAST(t.salary_value AS float) FROM ( SELECT t.id_user , t.salary_value , row_number() OVER(PARTITION BY t.id_user ORDER BY t.salary_date ) AS rowrank FROM employee t) AS t INNER JOIN employee t1 ON t1.id_user = t.id_user WHERE t.rowrank = 1 GROUP BY t1.id_user, t1.salary_value, t1.salary_date, t.salary_value, t.rowrank ORDER BY t1.id_user, t1.salary_date DESC )而不是nf ntlk

更改

nltk

到

tagged = ntlk.pos_tag(words)

未定义名称“ nltk”

2 个答案: