csv

How to read data in Python dataframe without concatenating?

由 戏子无情 提交于 2021-02-15 10:15:54
问题 I want to read the file f (file size:85GB) in chunks to a dataframe. Following code is suggested. chunksize = 5 TextFileReader = pd.read_csv(f, chunksize=chunksize) However, this code gives me TextFileReader, not dataframe. Also, I don't want to concatenate these chunks to convert TextFileReader to dataframe because of the memory limit. Please advise. 回答1: As you are trying to process 85GB CSV file, if you will try to read all the data by breaking it into chunks and converting it into

How to read data in Python dataframe without concatenating?

由 泪湿孤枕 提交于 2021-02-15 10:13:26
问题 I want to read the file f (file size:85GB) in chunks to a dataframe. Following code is suggested. chunksize = 5 TextFileReader = pd.read_csv(f, chunksize=chunksize) However, this code gives me TextFileReader, not dataframe. Also, I don't want to concatenate these chunks to convert TextFileReader to dataframe because of the memory limit. Please advise. 回答1: As you are trying to process 85GB CSV file, if you will try to read all the data by breaking it into chunks and converting it into

How to read data in Python dataframe without concatenating?

由 风格不统一 提交于 2021-02-15 10:12:33
问题 I want to read the file f (file size:85GB) in chunks to a dataframe. Following code is suggested. chunksize = 5 TextFileReader = pd.read_csv(f, chunksize=chunksize) However, this code gives me TextFileReader, not dataframe. Also, I don't want to concatenate these chunks to convert TextFileReader to dataframe because of the memory limit. Please advise. 回答1: As you are trying to process 85GB CSV file, if you will try to read all the data by breaking it into chunks and converting it into

its all about the logic: findall posts & the corresponding threads - on vbulletin

由 允我心安 提交于 2021-02-15 07:42:58
问题 fellow stackers, i am working to get the discourse of a user in vbulletin: Main goal: at the end we have all the threads (and discourses) where our demo-user is involved. on a sidenote: This means that we should keep in mind a nice presentation of the gathered results. For working out the logic that enables us to use this technique - on all Vbulletin (that run version 3.8xy). we choose a demo-page[which is only a example with an open board - visible to anybody without registration]. starting

its all about the logic: findall posts & the corresponding threads - on vbulletin

由 本秂侑毒 提交于 2021-02-15 07:41:49
问题 fellow stackers, i am working to get the discourse of a user in vbulletin: Main goal: at the end we have all the threads (and discourses) where our demo-user is involved. on a sidenote: This means that we should keep in mind a nice presentation of the gathered results. For working out the logic that enables us to use this technique - on all Vbulletin (that run version 3.8xy). we choose a demo-page[which is only a example with an open board - visible to anybody without registration]. starting

Why query won't save in csv file while it's seems normal in postgresql console

由 杀马特。学长 韩版系。学妹 提交于 2021-02-15 06:55:49
问题 I have this query which i want to save in csv file or html select phone_number, count(driver_callsign), driver_callsign from archived_order where data like '%"ptt":3%' and completed is true and ds_id = 16 and created > (select current_date - interval '7 days') group by archived_order.phone_number, archived_order.driver_callsign HAVING COUNT(driver_callsign) > 1; When i using it in psql console - it seems normal. There is output: phone_number | count | driver_callsign ---------------+-------+-

How to delete rows from a csv file based on a list values from another file?

由 佐手、 提交于 2021-02-13 12:16:43
问题 I have two files: candidates.csv : id,value 1,123 4,1 2,5 50,5 blacklist.csv : 1 2 5 3 10 I'd like to remove all rows from candidates.csv in which the first column ( id ) has a value contained in blacklist.csv . id is always numeric. In this case I'd like my output to look like this: id,value 4,1 50,5 So far, my script for identifying the duplicate lines looks like this: cat candidates.csv | cut -d \, -f 1 | grep -f blacklist.csv -w This gives me the output 1 2 Now I somehow need to pipe this

How to delete rows from a csv file based on a list values from another file?

由 百般思念 提交于 2021-02-13 12:15:52
问题 I have two files: candidates.csv : id,value 1,123 4,1 2,5 50,5 blacklist.csv : 1 2 5 3 10 I'd like to remove all rows from candidates.csv in which the first column ( id ) has a value contained in blacklist.csv . id is always numeric. In this case I'd like my output to look like this: id,value 4,1 50,5 So far, my script for identifying the duplicate lines looks like this: cat candidates.csv | cut -d \, -f 1 | grep -f blacklist.csv -w This gives me the output 1 2 Now I somehow need to pipe this

CSV文件的读写

由 烂漫一生 提交于 2021-02-12 19:37:34
try { File file = new File("..\\alzmxy_20171018.csv"); BufferedReader reader = new BufferedReader(new FileReader(file)); List<UserInfo> userInfos = Lists.newArrayList(); String userString = null; // userString 每一行的数据，单元格间以“,”隔开 while ((userString = reader.readLine()) != null) { String[] array = StringUtils.split(userString, ","); userInfos.add(new UserInfo(array[0], array[1], array[2])); } reader.close(); // 写 FileOutputStream outputStream = new FileOutputStream("..\\alzmxy_20171018.bak.csv"); // 避免中文乱码 OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, "gbk");

psql import .csv - Double Quoted fields and Single Double Quote Values

由 ≡放荡痞女 提交于 2021-02-11 17:39:37
问题 Hello Stack Overflowers, Weird question. I am having trouble importing a .csv file using psql command line arguments... The .csv is comma delimited and there are double quotes around cells/fields that have commas in them. I run into an issue where one of the cells/fields has a single double-quote that is being used for inches. So in the example below, it thinks the bottom two rows are all one cell/field. I can't seem to find a way to make this import correctly. I am hoping to not have to make
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