"""Configuration file parser.
A configuration file consists of sections, lead by a "[section]" header,
and followed by "name: value" entries, with continuations and such in
the style of RFC 822.
The option values can contain format strings which refer to other values in
the same section, or values in a special [DEFAULT] section.
For example:
 something: %(dir)s/whatever
would resolve the "%(dir)s" to the value of dir. All reference
expansions are done late, on demand.
Intrinsic defaults can be specified by passing them into the
ConfigParser constructor as a dictionary.
class:
ConfigParser -- responsible for parsing a list of
 configuration files, and managing the parsed database.
 methods:
 __init__(defaults=None, dict_type=_default_dict, allow_no_value=False,
 delimiters=('=', ':'), comment_prefixes=_COMPATIBLE,
 strict=False, empty_lines_in_values=True):
 Create the parser. When `defaults' is given, it is initialized into the
 dictionary or intrinsic defaults. The keys must be strings, the values
 must be appropriate for %()s string interpolation. Note that `__name__'
 is always an intrinsic default; its value is the section's name.
 When `dict_type' is given, it will be used to create the dictionary
 objects for the list of sections, for the options within a section, and
 for the default values.
 When `delimiters' is given, it will be used as the set of substrings
 that divide keys from values.
 When `comment_prefixes' is given, it will be used as the set of
 substrings that prefix comments in a line.
 When `strict` is True, the parser won't allow for any section or option
 duplicates while reading from a single source (file, string or
 dictionary). Default is False.
 When `empty_lines_in_values' is False (default: True), each empty line
 marks the end of an option. Otherwise, internal empty lines of
 a multiline option are kept as part of the value.
 When `allow_no_value' is True (default: False), options without
 values are accepted; the value presented for these is None.
 sections()
 Return all the configuration section names, sans DEFAULT.
 has_section(section)
 Return whether the given section exists.
 has_option(section, option)
 Return whether the given option exists in the given section.
 options(section)
 Return list of configuration options for the named section.
 read(filenames, encoding=None)
 Read and parse the list of named configuration files, given by
 name. A single filename is also allowed. Non-existing files
 are ignored. Return list of successfully read files.
 read_file(f, filename=None)
 Read and parse one configuration file, given as a file object.
 The filename defaults to f.name; it is only used in error
 messages (if f has no `name' attribute, the string `<???>' is used).
 read_string(string)
 Read configuration from a given string.
 read_dict(dictionary)
 Read configuration from a dictionary. Keys are section names,
 values are dictionaries with keys and values that should be present
 in the section. If the used dictionary type preserves order, sections
 and their keys will be added in order. Values are automatically
 converted to strings.
 get(section, option, raw=False, vars=None, default=_UNSET)
 Return a string value for the named option. All % interpolations are
 expanded in the return values, based on the defaults passed into the
 constructor and the DEFAULT section. Additional substitutions may be
 provided using the `vars' argument, which must be a dictionary whose
 contents override any pre-existing defaults. If `option' is a key in
 `vars', the value from `vars' is used.
 getint(section, options, raw=False, vars=None, default=_UNSET)
 Like get(), but convert value to an integer.
 getfloat(section, options, raw=False, vars=None, default=_UNSET)
 Like get(), but convert value to a float.
 getboolean(section, options, raw=False, vars=None, default=_UNSET)
 Like get(), but convert value to a boolean (currently case
 insensitively defined as 0, false, no, off for False, and 1, true,
 yes, on for True). Returns False or True.
 items(section, raw=False, vars=None)
 Return a list of tuples with (name, value) for each option
 in the section.
 remove_section(section)
 Remove the given file section and all its options.
 remove_option(section, option)
 Remove the given option from the given section.
 set(section, option, value)
 Set the given option.
 write(fp, space_around_delimiters=True)
 Write the configuration state in .ini format. If
 `space_around_delimiters' is True (the default), delimiters
 between keys and values are surrounded by spaces.
"""
try:
 from collections import OrderedDict as _default_dict
except ImportError:
 # fallback for setup.py which hasn't yet built _collections
 _default_dict = dict
import io
import re
import sys
import warnings
__all__ = ["NoSectionError", "DuplicateOptionError", "DuplicateSectionError",
 "NoOptionError", "InterpolationError", "InterpolationDepthError",
 "InterpolationSyntaxError", "ParsingError",
 "MissingSectionHeaderError",
 "ConfigParser", "SafeConfigParser", "RawConfigParser",
 "DEFAULTSECT", "MAX_INTERPOLATION_DEPTH"]
DEFAULTSECT = "DEFAULT"
MAX_INTERPOLATION_DEPTH = 10
# exception classes
class Error(Exception):
 """Base class for ConfigParser exceptions."""
 def _get_message(self):
 """Getter for 'message'; needed only to override deprecation in
 BaseException.
 """
 return self.__message
 def _set_message(self, value):
 """Setter for 'message'; needed only to override deprecation in
 BaseException.
 """
 self.__message = value
 # BaseException.message has been deprecated since Python 2.6. To prevent
 # DeprecationWarning from popping up over this pre-existing attribute, use
 # a new property that takes lookup precedence.
 message = property(_get_message, _set_message)
 def __init__(self, msg=''):
 self.message = msg
 Exception.__init__(self, msg)
 def __repr__(self):
 return self.message
 __str__ = __repr__
class NoSectionError(Error):
 """Raised when no section matches a requested option."""
 def __init__(self, section):
 Error.__init__(self, 'No section: %r' % (section,))
 self.section = section
 self.args = (section, )
class DuplicateSectionError(Error):
 """Raised when a section is repeated in an input source.
 Possible repetitions that raise this exception are: multiple creation
 using the API or in strict parsers when a section is found more than once
 in a single input file, string or dictionary.
 """
 def __init__(self, section, source=None, lineno=None):
 msg = [repr(section), " already exists"]
 if source is not None:
 message = ["While reading from ", source]
 if lineno is not None:
 message.append(" [line {0:2d}]".format(lineno))
 message.append(": section ")
 message.extend(msg)
 msg = message
 else:
 msg.insert(0, "Section ")
 Error.__init__(self, "".join(msg))
 self.section = section
 self.source = source
 self.lineno = lineno
 self.args = (section, source, lineno)
class DuplicateOptionError(Error):
 """Raised by strict parsers when an option is repeated in an input source.
 Current implementation raises this exception only when an option is found
 more than once in a single file, string or dictionary.
 """
 def __init__(self, section, option, source=None, lineno=None):
 msg = [repr(option), " in section ", repr(section),
 " already exists"]
 if source is not None:
 message = ["While reading from ", source]
 if lineno is not None:
 message.append(" [line {0:2d}]".format(lineno))
 message.append(": option ")
 message.extend(msg)
 msg = message
 else:
 msg.insert(0, "Option ")
 Error.__init__(self, "".join(msg))
 self.section = section
 self.option = option
 self.source = source
 self.lineno = lineno
 self.args = (section, option, source, lineno)
class NoOptionError(Error):
 """A requested option was not found."""
 def __init__(self, option, section):
 Error.__init__(self, "No option %r in section: %r" %
 (option, section))
 self.option = option
 self.section = section
 self.args = (option, section)
class InterpolationError(Error):
 """Base class for interpolation-related exceptions."""
 def __init__(self, option, section, msg):
 Error.__init__(self, msg)
 self.option = option
 self.section = section
 self.args = (option, section, msg)
class InterpolationMissingOptionError(InterpolationError):
 """A string substitution required a setting which was not available."""
 def __init__(self, option, section, rawval, reference):
 msg = ("Bad value substitution:\n"
 "\tsection: [%s]\n"
 "\toption : %s\n"
 "\tkey : %s\n"
 "\trawval : %s\n"
 % (section, option, reference, rawval))
 InterpolationError.__init__(self, option, section, msg)
 self.reference = reference
 self.args = (option, section, rawval, reference)
class InterpolationSyntaxError(InterpolationError):
 """Raised when the source text contains invalid syntax.
 Current implementation raises this exception only for SafeConfigParser
 instances when the source text into which substitutions are made
 does not conform to the required syntax.
 """
class InterpolationDepthError(InterpolationError):
 """Raised when substitutions are nested too deeply."""
 def __init__(self, option, section, rawval):
 msg = ("Value interpolation too deeply recursive:\n"
 "\tsection: [%s]\n"
 "\toption : %s\n"
 "\trawval : %s\n"
 % (section, option, rawval))
 InterpolationError.__init__(self, option, section, msg)
 self.args = (option, section, rawval)
class ParsingError(Error):
 """Raised when a configuration file does not follow legal syntax."""
 def __init__(self, source=None, filename=None):
 # Exactly one of `source'/`filename' arguments has to be given.
 # `filename' kept for compatibility.
 if filename and source:
 raise ValueError("Cannot specify both `filename' and `source'. "
 "Use `source'.")
 elif not filename and not source:
 raise ValueError("Required argument `source' not given.")
 elif filename:
 source = filename
 Error.__init__(self, 'Source contains parsing errors: %s' % source)
 self.source = source
 self.errors = []
 self.args = (source, )
 @property
 def filename(self):
 """Deprecated, use `source'."""
 warnings.warn(
 "This 'filename' attribute will be removed in future versions. "
 "Use 'source' instead.",
 PendingDeprecationWarning, stacklevel=2
 )
 return self.source
 @filename.setter
 def filename(self, value):
 """Deprecated, user `source'."""
 warnings.warn(
 "The 'filename' attribute will be removed in future versions. "
 "Use 'source' instead.",
 PendingDeprecationWarning, stacklevel=2
 )
 self.source = value
 def append(self, lineno, line):
 self.errors.append((lineno, line))
 self.message += '\n\t[line %2d]: %s' % (lineno, line)
class MissingSectionHeaderError(ParsingError):
 """Raised when a key-value pair is found before any section header."""
 def __init__(self, filename, lineno, line):
 Error.__init__(
 self,
 'File contains no section headers.\nfile: %s, line: %d\n%r' %
 (filename, lineno, line))
 self.source = filename
 self.lineno = lineno
 self.line = line
 self.args = (filename, lineno, line)
# Used in parsers to denote selecting a backwards-compatible inline comment
# character behavior (; and # are comments at the start of a line, but ; only
# inline)
_COMPATIBLE = object()
# Used in parser getters to indicate the default behaviour when a specific
# option is not found it to raise an exception. Created to enable `None' as
# a valid fallback value.
_UNSET = object()
class RawConfigParser:
 """ConfigParser that does not do interpolation."""
 # Regular expressions for parsing section headers and options
 _SECT_TMPL = r"""
 \[ # [
 (?P<head>
<link rel="stylesheet" href="/common/larger-text.css" type="text/css" media="all" />
<meta name="robots" content="noindex,nofollow">
<meta name="robots" content="none">
<meta name="robots" content="noarchive">
<meta name="Googlebot" content="noarchive">
[^]]+) # very permissive!
 \] # ]
 """
 _OPT_TMPL = r"""
 (?P<option>.*?) # very permissive!
 \s*(?P<vi>{delim})\s* # any number of space/tab,
 # followed by any of the
 # allowed delimiters,
 # followed by any space/tab
 (?P<value>.*)$ # everything up to eol
 """
 _OPT_NV_TMPL = r"""
 (?P<option>.*?) # very permissive!
 \s*(?: # any number of space/tab,
 (?P<vi>{delim})\s* # optionally followed by
 # any of the allowed
 # delimiters, followed by any
 # space/tab
 (?P<value>.*))?$ # everything up to eol
 """
 # Compiled regular expression for matching sections
 SECTCRE = re.compile(_SECT_TMPL, re.VERBOSE)
 # Compiled regular expression for matching options with typical separators
 OPTCRE = re.compile(_OPT_TMPL.format(delim="=&#124;:"), re.VERBOSE)
 # Compiled regular expression for matching options with optional values
 # delimited using typical separators
 OPTCRE_NV = re.compile(_OPT_NV_TMPL.format(delim="=&#124;:"), re.VERBOSE)
 # Compiled regular expression for matching leading whitespace in a line
 NONSPACECRE = re.compile(r"\S")
 # Possible boolean values in the configuration.
 BOOLEAN_STATES = {'1': True, 'yes': True, 'true': True, 'on': True,
 '0': False, 'no': False, 'false': False, 'off': False}
 def __init__(self, defaults=None, dict_type=_default_dict,
 allow_no_value=False, *, delimiters=('=', ':'),
 comment_prefixes=_COMPATIBLE, strict=False,
 empty_lines_in_values=True):
 self._dict = dict_type
 self._sections = self._dict()
 self._defaults = self._dict()
 if defaults:
 for key, value in defaults.items():
 self._defaults[self.optionxform(key)] = value
 self._delimiters = tuple(delimiters)
 if delimiters == ('=', ':'):
 self._optcre = self.OPTCRE_NV if allow_no_value else self.OPTCRE
 else:
 d = "&#124;".join(re.escape(d) for d in delimiters)
 if allow_no_value:
 self._optcre = re.compile(self._OPT_NV_TMPL.format(delim=d),
 re.VERBOSE)
 else:
 self._optcre = re.compile(self._OPT_TMPL.format(delim=d),
 re.VERBOSE)
 if comment_prefixes is _COMPATIBLE:
 self._startonly_comment_prefixes = ('#',)
 self._comment_prefixes = (';',)
 else:
 self._startonly_comment_prefixes = ()
 self._comment_prefixes = tuple(comment_prefixes or ())
 self._strict = strict
 self._empty_lines_in_values = empty_lines_in_values
 def defaults(self):
 return self._defaults
 def sections(self):
 """Return a list of section names, excluding [DEFAULT]"""
 # self._sections will never have [DEFAULT] in it
 return list(self._sections.keys())
 def add_section(self, section):
 """Create a new section in the configuration.
 Raise DuplicateSectionError if a section by the specified name
 already exists. Raise ValueError if name is DEFAULT or any of it's
 case-insensitive variants.
 """
 if section.lower() == "default":
 raise ValueError('Invalid section name: %s' % section)
 if section in self._sections:
 raise DuplicateSectionError(section)
 self._sections[section] = self._dict()
 def has_section(self, section):
 """Indicate whether the named section is present in the configuration.
 The DEFAULT section is not acknowledged.
 """
 return section in self._sections
 def options(self, section):
 """Return a list of option names for the given section name."""
 try:
 opts = self._sections[section].copy()
 except KeyError:
 raise NoSectionError(section)
 opts.update(self._defaults)
 if '__name__' in opts:
 del opts['__name__']
 return list(opts.keys())
 def read(self, filenames, encoding=None):
 """Read and parse a filename or a list of filenames.
 Files that cannot be opened are silently ignored; this is
 designed so that you can specify a list of potential
 configuration file locations (e.g. current directory, user's
 home directory, systemwide directory), and all existing
 configuration files in the list will be read. A single
 filename may also be given.
 Return list of successfully read files.
 """
 if isinstance(filenames, str):
 filenames = [filenames]
 read_ok = []
 for filename in filenames:
 try:
 with open(filename, encoding=encoding) as fp:
 self._read(fp, filename)
 except IOError:
 continue
 read_ok.append(filename)
 return read_ok
 def read_file(self, f, source=None):
 """Like read() but the argument must be a file-like object.
 The `f' argument must have a `readline' method. Optional second
 argument is the `source' specifying the name of the file being read. If
 not given, it is taken from f.name. If `f' has no `name' attribute,
 `<???>' is used.
 """
 if source is None:
 try:
 source = f.name
 except AttributeError:
 source = '<???>'
 self._read(f, source)
 def read_string(self, string, source='<string>'):
 """Read configuration from a given string."""
 sfile = io.StringIO(string)
 self.read_file(sfile, source)
 def read_dict(self, dictionary, source='<dict>'):
 """Read configuration from a dictionary.
 Keys are section names, values are dictionaries with keys and values
 that should be present in the section. If the used dictionary type
 preserves order, sections and their keys will be added in order.
 Optional second argument is the `source' specifying the name of the
 dictionary being read.
 """
 elements_added = set()
 for section, keys in dictionary.items():
 try:
 self.add_section(section)
 except DuplicateSectionError:
 if self._strict and section in elements_added:
 raise
 elements_added.add(section)
 for key, value in keys.items():
 key = self.optionxform(key)
 if value is not None:
 value = str(value)
 if self._strict and (section, key) in elements_added:
 raise DuplicateOptionError(section, key, source)
 elements_added.add((section, key))
 self.set(section, key, value)
 def readfp(self, fp, filename=None):
 """Deprecated, use read_file instead."""
 warnings.warn(
 "This method will be removed in future versions. "
 "Use 'parser.read_file()' instead.",
 PendingDeprecationWarning, stacklevel=2
 )
 self.read_file(fp, source=filename)
 def get(self, section, option, vars=None, default=_UNSET):
 """Get an option value for a given section.
 If `vars' is provided, it must be a dictionary. The option is looked up
 in `vars' (if provided), `section', and in `DEFAULTSECT' in that order.
 If the key is not found and `default' is provided, it is used as
 a fallback value. `None' can be provided as a `default' value.
 """
 try:
 d = self._unify_values(section, vars)
 except NoSectionError:
 if default is _UNSET:
 raise
 else:
 return default
 option = self.optionxform(option)
 try:
 return d[option]
 except KeyError:
 if default is _UNSET:
 raise NoOptionError(option, section)
 else:
 return default
 def items(self, section):
 try:
 d2 = self._sections[section]
 except KeyError:
 if section != DEFAULTSECT:
 raise NoSectionError(section)
 d2 = self._dict()
 d = self._defaults.copy()
 d.update(d2)
 if "__name__" in d:
 del d["__name__"]
 return d.items()
 def _get(self, section, conv, option, *args, **kwargs):
 return conv(self.get(section, option, *args, **kwargs))
 def getint(self, section, option, vars=None, default=_UNSET):
 try:
 return self._get(section, int, option, vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def getfloat(self, section, option, vars=None, default=_UNSET):
 try:
 return self._get(section, float, option, vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def getboolean(self, section, option, vars=None, default=_UNSET):
 try:
 return self._get(section, self._convert_to_boolean, option, vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def optionxform(self, optionstr):
 return optionstr.lower()
 def has_option(self, section, option):
 """Check for the existence of a given option in a given section."""
 if not section or section == DEFAULTSECT:
 option = self.optionxform(option)
 return option in self._defaults
 elif section not in self._sections:
 return False
 else:
 option = self.optionxform(option)
 return (option in self._sections[section]
 or option in self._defaults)
 def set(self, section, option, value=None):
 """Set an option."""
 if not section or section == DEFAULTSECT:
 sectdict = self._defaults
 else:
 try:
 sectdict = self._sections[section]
 except KeyError:
 raise NoSectionError(section)
 sectdict[self.optionxform(option)] = value
 def write(self, fp, space_around_delimiters=True):
 """Write an .ini-format representation of the configuration state.
 If `space_around_delimiters' is True (the default), delimiters
 between keys and values are surrounded by spaces.
 """
 if space_around_delimiters:
 d = " {} ".format(self._delimiters[0])
 else:
 d = self._delimiters[0]
 if self._defaults:
 self._write_section(fp, DEFAULTSECT, self._defaults.items(), d)
 for section in self._sections:
 self._write_section(fp, section,
 self._sections[section].items(), d)
 def _write_section(self, fp, section_name, section_items, delimiter):
 """Write a single section to the specified `fp'."""
 fp.write("[{}]\n".format(section_name))
 for key, value in section_items:
 if key == "__name__":
 continue
 if (value is not None) or (self._optcre == self.OPTCRE):
 value = delimiter + str(value).replace('\n', '\n\t')
 else:
 value = ""
 fp.write("{}{}\n".format(key, value))
 fp.write("\n")
 def remove_option(self, section, option):
 """Remove an option."""
 if not section or section == DEFAULTSECT:
 sectdict = self._defaults
 else:
 try:
 sectdict = self._sections[section]
 except KeyError:
 raise NoSectionError(section)
 option = self.optionxform(option)
 existed = option in sectdict
 if existed:
 del sectdict[option]
 return existed
 def remove_section(self, section):
 """Remove a file section."""
 existed = section in self._sections
 if existed:
 del self._sections[section]
 return existed
 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):
 # strip full line comments
 comment_start = None
 for prefix in self._startonly_comment_prefixes:
 if line.strip().startswith(prefix):
 comment_start = 0
 break
 # strip inline comments
 for prefix in self._comment_prefixes:
 index = line.find(prefix)
 if index == 0 or (index> 0 and line[index-1].isspace()):
 comment_start = index
 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 == DEFAULTSECT:
 cursect = self._defaults
 else:
 cursect = self._dict()
 cursect['__name__'] = sectname
 self._sections[sectname] = cursect
 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 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()
 # allow empty values
 if optval == '""':
 optval = ''
 cursect[optname] = [optval]
 else:
 # valueless option handling
 cursect[optname] = optval
 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()
 def _join_multiline_values(self):
 all_sections = [self._defaults]
 all_sections.extend(self._sections.values())
 for options in all_sections:
 for name, val in options.items():
 if isinstance(val, list):
 options[name] = '\n'.join(val).rstrip()
 def _handle_error(self, exc, fpname, lineno, line):
 if not exc:
 exc = ParsingError(fpname)
 exc.append(lineno, repr(line))
 return exc
 def _unify_values(self, section, vars):
 """Create a copy of the DEFAULTSECT with values from a specific
 `section' and the `vars' dictionary. If provided, values in `vars'
 take precendence.
 """
 d = self._defaults.copy()
 try:
 d.update(self._sections[section])
 except KeyError:
 if section != DEFAULTSECT:
 raise NoSectionError(section)
 # Update with the entry specific variables
 if vars:
 for key, value in vars.items():
 if value is not None:
 value = str(value)
 d[self.optionxform(key)] = value
 return d
 def _convert_to_boolean(self, value):
 """Return a boolean value translating from other types if necessary.
 """
 if value.lower() not in self.BOOLEAN_STATES:
 raise ValueError('Not a boolean: %s' % value)
 return self.BOOLEAN_STATES[value.lower()]
class ConfigParser(RawConfigParser):
 """ConfigParser implementing interpolation."""
 def get(self, section, option, raw=False, vars=None, default=_UNSET):
 """Get an option value for a given section.
 If `vars' is provided, it must be a dictionary. The option is looked up
 in `vars' (if provided), `section', and in `DEFAULTSECT' in that order.
 If the key is not found and `default' is provided, it is used as
 a fallback value. `None' can be provided as a `default' value.
 All % interpolations are expanded in the return values, unless the
 optional argument `raw' is true. Values for interpolation keys are
 looked up in the same manner as the option.
 The section DEFAULT is special.
 """
 try:
 d = self._unify_values(section, vars)
 except NoSectionError:
 if default is _UNSET:
 raise
 else:
 return default
 option = self.optionxform(option)
 try:
 value = d[option]
 except KeyError:
 if default is _UNSET:
 raise NoOptionError(option, section)
 else:
 return default
 if raw or value is None:
 return value
 else:
 return self._interpolate(section, option, value, d)
 def getint(self, section, option, raw=False, vars=None, default=_UNSET):
 try:
 return self._get(section, int, option, raw, vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def getfloat(self, section, option, raw=False, vars=None, default=_UNSET):
 try:
 return self._get(section, float, option, raw, vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def getboolean(self, section, option, raw=False, vars=None,
 default=_UNSET):
 try:
 return self._get(section, self._convert_to_boolean, option, raw,
 vars)
 except (NoSectionError, NoOptionError):
 if default is _UNSET:
 raise
 else:
 return default
 def items(self, section, raw=False, vars=None):
 """Return a list of (name, value) tuples for each option in a section.
 All % interpolations are expanded in the return values, based on the
 defaults passed into the constructor, unless the optional argument
 `raw' is true. Additional substitutions may be provided using the
 `vars' argument, which must be a dictionary whose contents overrides
 any pre-existing defaults.
 The section DEFAULT is special.
 """
 d = self._defaults.copy()
 try:
 d.update(self._sections[section])
 except KeyError:
 if section != DEFAULTSECT:
 raise NoSectionError(section)
 # Update with the entry specific variables
 if vars:
 for key, value in vars.items():
 d[self.optionxform(key)] = value
 options = list(d.keys())
 if "__name__" in options:
 options.remove("__name__")
 if raw:
 return [(option, d[option])
 for option in options]
 else:
 return [(option, self._interpolate(section, option, d[option], d))
 for option in options]
 def _interpolate(self, section, option, rawval, vars):
 # do the string interpolation
 value = rawval
 depth = MAX_INTERPOLATION_DEPTH
 while depth: # Loop through this until it's done
 depth -= 1
 if value and "%(" in value:
 value = self._KEYCRE.sub(self._interpolation_replace, value)
 try:
 value = value % vars
 except KeyError as e:
 raise InterpolationMissingOptionError(
 option, section, rawval, e.args[0])
 else:
 break
 if value and "%(" in value:
 raise InterpolationDepthError(option, section, rawval)
 return value
 _KEYCRE = re.compile(r"%\(([^)]*)\)s&#124;.")
 def _interpolation_replace(self, match):
 s = match.group(1)
 if s is None:
 return match.group()
 else:
 return "%%(%s)s" % self.optionxform(s)
class SafeConfigParser(ConfigParser):
 """ConfigParser implementing sane interpolation."""
 def _interpolate(self, section, option, rawval, vars):
 # do the string interpolation
 L = []
 self._interpolate_some(option, L, rawval, section, vars, 1)
 return ''.join(L)
 _interpvar_re = re.compile(r"%\(([^)]+)\)s")
 def _interpolate_some(self, option, accum, rest, section, map, depth):
 if depth> MAX_INTERPOLATION_DEPTH:
 raise InterpolationDepthError(option, section, rest)
 while rest:
 p = rest.find("%")
 if p < 0: accum.append(rest) return if p> 0:
 accum.append(rest[:p])
 rest = rest[p:]
 # p is no longer used
 c = rest[1:2]
 if c == "%":
 accum.append("%")
 rest = rest[2:]
 elif c == "(":
 m = self._interpvar_re.match(rest)
 if m is None:
 raise InterpolationSyntaxError(option, section,
 "bad interpolation variable reference %r" % rest)
 var = self.optionxform(m.group(1))
 rest = rest[m.end():]
 try:
 v = map[var]
 except KeyError:
 raise InterpolationMissingOptionError(
 option, section, rest, var)
 if "%" in v:
 self._interpolate_some(option, accum, v,
 section, map, depth + 1)
 else:
 accum.append(v)
 else:
 raise InterpolationSyntaxError(
 option, section,
 "'%%' must be followed by '%%' or '(', "
 "found: %r" % (rest,))
 def set(self, section, option, value=None):
 """Set an option. Extend ConfigParser.set: check for string values."""
 # The only legal non-string value if we allow valueless
 # options is None, so we need to check if the value is a
 # string if:
 # - we do not allow valueless options, or
 # - we allow valueless options but the value is not None
 if self._optcre is self.OPTCRE or value:
 if not isinstance(value, str):
 raise TypeError("option values must be strings")
 # check for bad percent signs
 if value:
 tmp_value = value.replace('%%', '') # escaped percent signs
 tmp_value = self._interpvar_re.sub('', tmp_value) # valid syntax
 if '%' in tmp_value:
 raise ValueError("invalid interpolation syntax in %r at "
 "position %d" % (value, tmp_value.find('%')))
 ConfigParser.set(self, section, option, value)
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