2.异常“line contains NULL byte”可以对打开的文件作如下处理,

csvfile = open(filepath,"rb"); #打开一个csv文件
reader = csv.DictReader((line.replace('\0','') for line in csvfile),delimiter=",");
即将NULL byte替换掉。


1)Fields with embedded commas must be quoted.(当字段值中包含有半角逗号时,整个字段需要quoted),例如:

 1997,Ford,E350,"Super, luxurious truck" 

2)Fields with embedded double-quote characters must be quoted, and each of the embedded double-quote characters must be represented by a pair of double-quote characters.(当字段值中含有半角双引号时,整个字段需要quoted,并且被包含的每一个半角双引号都要被替换成一对半角双引号),例如:

 1997,Ford,E350,"Super, ""luxurious"" truck" 

3)Fields with embedded line breaks must be quoted (however, many CSV implementations simply do not support this).(当字段值中有换行是,整个字段需要quoted。然而很多CSV模块的实现都不支持字段内有换行。PS:Python是支持的),例如:

1997,Ford,E350,"Go get one now
they are going fast"

4)In CSV implementations that do trim leading or trailing spaces, fields with such spaces as meaningful data must be quoted.(字段值需要以空格开头时,整个字段需要quoted),例如:

 1997,Ford,E350," Super luxurious truck "