我想读一个包含Astropy表中行尾注释的ascii文件。像这样:
a | b
1 | 2
3 | 4 # this is a comment
# another comment
5 | 6
如图here所示,这并不是我想要的:
Table.read(filename, format='ascii.csv', delimiter='|', comment='\s*#')
我需要将哪些选项传递给Table.read
才能使其正常工作?
答案 0 :(得分:3)
没有内置方法可以做到这一点,但它只需要几行自定义代码。基本思想是创建CSV reader的子类,用你自己的Data类覆盖data_class = CsvData
,它本身是CsvData
的子类。在您的Data子类中,覆盖process_lines
方法以执行自定义注释行处理。查看BaseData
中的core.py
课程,了解基线process_lines
行为。
from astropy.io.ascii.basic import Csv, CsvData
class CsvCommentData(CsvData):
comment = '#' # regular expression not allowed for this reader
def _strip_trailing_comments(self, lines):
for line in lines:
index = line.rfind(self.comment)
if index >= 0:
line = line[:index]
yield line
def process_lines(self, lines):
return super(CsvCommentData, self).process_lines(self._strip_trailing_comments(lines))
class CsvComment(Csv):
_format_name = 'csv_comment'
_io_registry_can_write = True
_description = 'Comma-separated-values with trailing comments allowed'
data_class = CsvCommentData