data.table::fread 和不平衡的 " [英] data.table::fread and Unbalanced "
问题描述
当我尝试使用 data.table:fread(fn, sep=' ', header=T) 读取 csv 文件时，它给出了在这一行观察到的不平衡"错误.数据有3个整数变量和1个字符串变量.csv文件中的字符串没有用"括起来，是的，有些行包含"字符串变量和 " 字符不是成对的.
When I tried to read a csv file using data.table:fread(fn, sep=' ', header=T), it gives an "Unbalanced " observed on this line" error. The data has 3 integer variables and 1 string variable. The strings in the csv file are not enclosed with ", and yes there are some lines that contains " within the string variable and the " characters are not in pairs.
我想知道是否可以让 fread 忽略变量中未配对的 " 并继续读取数据?谢谢.
I am wondering is it possible to let fread just ignore the unpaired " in the variable and continue reading data? Thanks.
这里是示例数据(只有一条记录)
Here is the sample data(just one record)
N_ID VISIT_DATE REQ_URL REQType
175931 2013-3-8 23:40:30 http://aaa.com/rest/api2.do?api=getSetMobileSession&data={"imei":"60893ZTE-CN13cd","appkey":"android_client","content":"Z0JiRA0qPFtWM3BYVltmcx5MWF9ZS0YLdW1ydXoqPycuJS8idXdlY3R0TGBtU 1
推荐答案
更新:现已在 v1.8.11 中实现
来自新闻:
fread 现在在字段中间接受引号(' 和 ")，字段是否以 " 开头，而不是 'unbalanced引号的错误，#2694.感谢百度报道.众所周知并且记录在 ?fread 的顶部(现已删除文本).如果一个字段开始带有 " 它必须以 " 结尾(如果字段分隔符本身在字段内容).嵌入的引号也可以在列名中.换行符 ( )仍然不能在带引号的字段或带引号的列名中.
fread now accepts quotes (both ' and ") in the middle of fields, whether the field starts with " or not, rather than the 'unbalanced quotes' error, #2694. Thanks to baidao for reporting. It was known and documented at the top of ?fread (text now removed). If a field starts with " it must end with " (necessary if the field separator itself is in the field contents). Embedded quotes can be in column names too. Newlines ( ) still can't be in quoted fields or quoted column names, yet.
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是的，正如@agstudy 所说，嵌入引号是一个已知的记录问题，尚未实现，因为 fread 是新的.严格来说，我想这些不是嵌入的，因为您示例中的字符串不是以引号开头.
Yes as @agstudy said, embedded quotes are a known documented problem not yet implemented since fread is new. Strictly speaking, I suppose these ones aren't embedded because the string in your example doesn't start with a quote, though.
无论如何，我已将此作为错误报告提交，以免被遗忘.在下一个版本中完成.感谢您的强调.
Anyway, I've filed this as a bug report so it doesn't get forgotten. To be done in the next release. Thanks for highlighting.
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