我正在尝试用Python读取INI格式的项目文件。该文件包含一个部分中的重复键（具有唯一值）。例如，其中一个部分如下所示：
[Source Files]
Source="file1.c"
Source="file2.c"
Source="file3.c"
如果我使用以下代码阅读本文
config = configparser.ConfigParser( strict=False )
config.read( "project/file/name" )
print( config.get( "Source Files", "Source" ) )
结果是
"file3.c"
有没有办法获取密钥Source的所有值的列表？我愿意使用其他方法来解析文件。
请注意，我无法更改文件格式。
答案 0 :(得分：5)
我最终继承了RawConfigParser类来实现此功能。如果其他人对此感兴趣，这里是我正在使用的代码：
import configparser
class ConfigParserMultiOpt(configparser.RawConfigParser):
"""ConfigParser allowing duplicate keys. Values are stored in a list"""
def __init__(self):
configparser.RawConfigParser.__init__(self, empty_lines_in_values=False, strict=False)
def _read(self, fp, fpname):
"""Parse a sectioned configuration file.
Each section in a configuration file contains a header, indicated by
a name in square brackets (`[]'), plus key/value options, indicated by
`name' and `value' delimited with a specific substring (`=' or `:' by
default).
Values can span multiple lines, as long as they are indented deeper
than the first line of the value. Depending on the parser's mode, blank
lines may be treated as parts of multiline values or ignored.
Configuration files may include comments, prefixed by specific
characters (`#' and `;' by default). Comments may appear on their own
in an otherwise empty line or may be entered in lines holding values or
section names.
"""
elements_added = set()
cursect = None # None, or a dictionary
sectname = None
optname = None
lineno = 0
indent_level = 0
e = None # None, or an exception
for lineno, line in enumerate(fp, start=1):
comment_start = None
# strip inline comments
for prefix in self._inline_comment_prefixes:
index = line.find(prefix)
if index == 0 or (index > 0 and line[index-1].isspace()):
comment_start = index
break
# strip full line comments
for prefix in self._comment_prefixes:
if line.strip().startswith(prefix):
comment_start = 0
break
value = line[:comment_start].strip()
if not value:
if self._empty_lines_in_values:
# add empty line to the value, but only if there was no
# comment on the line
if (comment_start is None and
cursect is not None and
optname and
cursect[optname] is not None):
cursect[optname].append('') # newlines added at join
else:
# empty line marks end of value
indent_level = sys.maxsize
continue
# continuation line?
first_nonspace = self.NONSPACECRE.search(line)
cur_indent_level = first_nonspace.start() if first_nonspace else 0
if (cursect is not None and optname and
cur_indent_level > indent_level):
cursect[optname].append(value)
# a section header or option header?
else:
indent_level = cur_indent_level
# is it a section header?
mo = self.SECTCRE.match(value)
if mo:
sectname = mo.group('header')
if sectname in self._sections:
if self._strict and sectname in elements_added:
raise DuplicateSectionError(sectname, fpname,
lineno)
cursect = self._sections[sectname]
elements_added.add(sectname)
elif sectname == self.default_section:
cursect = self._defaults
else:
cursect = self._dict()
self._sections[sectname] = cursect
self._proxies[sectname] = configparser.SectionProxy(self, sectname)
elements_added.add(sectname)
# So sections can't start with a continuation line
optname = None
# no section header in the file?
elif cursect is None:
raise MissingSectionHeaderError(fpname, lineno, line)
# an option line?
else:
mo = self._optcre.match(value)
if mo:
optname, vi, optval = mo.group('option', 'vi', 'value')
if not optname:
e = self._handle_error(e, fpname, lineno, line)
optname = self.optionxform(optname.rstrip())
if (self._strict and
(sectname, optname) in elements_added):
raise configparser.DuplicateOptionError(sectname, optname, fpname, lineno)
elements_added.add((sectname, optname))
# This check is fine because the OPTCRE cannot
# match if it would set optval to None
if optval is not None:
optval = optval.strip()
# Check if this optname already exists
if (optname in cursect) and (cursect[optname] is not None):
# If it does, convert it to a tuple if it isn't already one
if not isinstance(cursect[optname], tuple):
cursect[optname] = tuple(cursect[optname])
cursect[optname] = cursect[optname] + tuple([optval])
else:
cursect[optname] = [optval]
else:
# valueless option handling
cursect[optname] = None
else:
# a non-fatal parsing error occurred. set up the
# exception but keep going. the exception will be
# raised at the end of the file and will contain a
# list of all bogus lines
e = self._handle_error(e, fpname, lineno, line)
# if any parsing errors occurred, raise an exception
if e:
raise e
self._join_multiline_values()
_read功能是从configparser.py复制粘贴的。我所做的唯一更改是在if行之后添加optval = optval.strip()条件。 ConfigParserMultiOpt会在tuple的某个部分中为重复键返回多个值。
我是Python新手，所以如果有人提出改进上述代码的建议，我会全力以赴！