API Documentation for configobj

Autogenerated API Docs

Contents

This is an autogenerated API Doc for the module "configobj".

It was generated on: Monday, January 01 06:46 PM.

Constants

Functions

flatten_errors

def flatten_errors(cfg, res, levels=None, results=None):

An example function that will turn a nested dictionary of results (as returned by ConfigObj.validate) into a flat list.

cfg is the ConfigObj instance being checked, res is the results dictionary returned by validate.

(This is a recursive function, so you shouldn't use the levels or results arguments - they are used by the function.

Returns a list of keys that failed. Each member of the list is a tuple :

([list of sections...], key, result)

If validate was called with preserve_errors=False (the default) then result will always be False.

list of sections is a flattened list of sections that the key was found in.

If the section was missing then key will be None.

If the value (or section) was missing then result will be False.

If validate was called with preserve_errors=True and a value was present, but failed the check, then result will be the exception object returned. You can use this as a string that describes the failure.

For example The value "3" is of the wrong type.

>>> import validate
>>> vtor = validate.Validator()
>>> my_ini = '''
...     option1 = True
...     [section1]
...     option1 = True
...     [section2]
...     another_option = Probably
...     [section3]
...     another_option = True
...     [[section3b]]
...     value = 3
...     value2 = a
...     value3 = 11
...     '''
>>> my_cfg = '''
...     option1 = boolean()
...     option2 = boolean()
...     option3 = boolean(default=Bad_value)
...     [section1]
...     option1 = boolean()
...     option2 = boolean()
...     option3 = boolean(default=Bad_value)
...     [section2]
...     another_option = boolean()
...     [section3]
...     another_option = boolean()
...     [[section3b]]
...     value = integer
...     value2 = integer
...     value3 = integer(0, 10)
...         [[[section3b-sub]]]
...         value = string
...     [section4]
...     another_option = boolean()
...     '''
>>> cs = my_cfg.split('\n')
>>> ini = my_ini.split('\n')
>>> cfg = ConfigObj(ini, configspec=cs)
>>> res = cfg.validate(vtor, preserve_errors=True)
>>> errors = []
>>> for entry in flatten_errors(cfg, res):
...     section_list, key, error = entry
...     section_list.insert(0, '[root]')
...     if key is not None:
...        section_list.append(key)
...     else:
...         section_list.append('[missing]')
...     section_string = ', '.join(section_list)
...     errors.append((section_string, ' = ', error))
>>> errors.sort()
>>> for entry in errors:
...     print entry[0], entry[1], (entry[2] or 0)
[root], option2  =  0
[root], option3  =  the value "Bad_value" is of the wrong type.
[root], section1, option2  =  0
[root], section1, option3  =  the value "Bad_value" is of the wrong type.
[root], section2, another_option  =  the value "Probably" is of the wrong type.
[root], section3, section3b, section3b-sub, [missing]  =  0
[root], section3, section3b, value2  =  the value "a" is of the wrong type.
[root], section3, section3b, value3  =  the value "11" is too big.
[root], section4, [missing]  =  0

getObj

def getObj(s):

unrepr

def unrepr(s):

Classes

Class Builder

class Builder:

Methods

build

def build(self, o):

build_Add

def build_Add(self, o):

build_Const

def build_Const(self, o):

build_Dict

def build_Dict(self, o):

build_Getattr

def build_Getattr(self, o):

build_List

def build_List(self, o):

build_Name

def build_Name(self, o):

build_Tuple

def build_Tuple(self, o):

build_UnaryAdd

def build_UnaryAdd(self, o):

build_UnarySub

def build_UnarySub(self, o):

Class ConfigObj

class ConfigObj(Section):
    def __init__(self, infile=None, options=None, **kwargs):

An object to read, create, and write config files.

Methods

validate

def validate(self, validator, preserve_errors=False, copy=False, section=None):

Test the ConfigObj against a configspec.

It uses the validator object from validate.py.

To run validate on the current ConfigObj, call:

test = config.validate(validator)

(Normally having previously passed in the configspec when the ConfigObj was created - you can dynamically assign a dictionary of checks to the configspec attribute of a section though).

It returns True if everything passes, or a dictionary of pass/fails (True/False). If every member of a subsection passes, it will just have the value True. (It also returns False if all members fail).

In addition, it converts the values from strings to their native types if their checks pass (and stringify is set).

If preserve_errors is True (False is default) then instead of a marking a fail with a False, it will preserve the actual exception object. This can contain info about the reason for failure. For example the VdtValueTooSmallError indeicates that the value supplied was too small. If a value (or section) is missing it will still be marked as False.

You must have the validate module to use preserve_errors=True.

You can then use the flatten_errors function to turn your nested results dictionary into a flattened list of failures - useful for displaying meaningful error messages.

write

def write(self, outfile=None, section=None):

Write the current ConfigObj as a file

tekNico: FIXME: use StringIO instead of real files

>>> filename = a.filename
>>> a.filename = 'test.ini'
>>> a.write()
>>> a.filename = filename
>>> a == ConfigObj('test.ini', raise_errors=True)
1

Class ConfigObjError

class ConfigObjError(SyntaxError):
    def __init__(self, message='', line_number=None, line=''):

This is the base class for all errors that ConfigObj raises. It is a subclass of SyntaxError.

Class ConfigParserInterpolation

class ConfigParserInterpolation(InterpolationEngine):

Behaves like ConfigParser.

Class ConfigspecError

class ConfigspecError(ConfigObjError):

An error occured whilst parsing a configspec.

Class DuplicateError

class DuplicateError(ConfigObjError):

The keyword or section specified already exists.

Class InterpolationEngine

class InterpolationEngine(object):
    def __init__(self, section):

A helper class to help perform string interpolation.

This class is an abstract base class; its descendants perform the actual work.

Methods

interpolate

def interpolate(self, key, value):

Class InterpolationError

class InterpolationError(ConfigObjError):

Base class for the two interpolation errors.

Class InterpolationLoopError

class InterpolationLoopError(InterpolationError):
    def __init__(self, option):

Maximum interpolation depth exceeded in string interpolation.

Class MissingInterpolationOption

class MissingInterpolationOption(InterpolationError):
    def __init__(self, option):

A value specified for interpolation was missing.

Class NestingError

class NestingError(ConfigObjError):

This error indicates a level of nesting that doesn't match.

Class ParseError

class ParseError(ConfigObjError):

This error indicates that a line is badly written. It is neither a valid key = value line, nor a valid section marker line.

Class RepeatSectionError

class RepeatSectionError(ConfigObjError):

This error indicates additional sections in a section with a __many__ (repeated) section.

Class Section

class Section(dict):
    def __init__(self, parent, depth, main, indict=None, name=None):

A dictionary-like object that represents a section in a config file.

It does string interpolation if the 'interpolation' attribute of the 'main' object is set to True.

Interpolation is tried first from this object, then from the 'DEFAULT' section of this object, next from the parent and its 'DEFAULT' section, and so on until the main object is reached.

A Section will behave like an ordered dictionary - following the order of the scalars and sections attributes. You can use this to change the order of members.

Iteration follows the order: scalars, then sections.

Methods

as_bool

def as_bool(self, key):

Accepts a key as input. The corresponding value must be a string or the objects (True or 1) or (False or 0). We allow 0 and 1 to retain compatibility with Python 2.2.

If the string is one of True, On, Yes, or 1 it returns True.

If the string is one of False, Off, No, or 0 it returns False.

as_bool is not case sensitive.

Any other input will raise a ValueError.

>>> a = ConfigObj()
>>> a['a'] = 'fish'
>>> a.as_bool('a')
Traceback (most recent call last):
ValueError: Value "fish" is neither True nor False
>>> a['b'] = 'True'
>>> a.as_bool('b')
1
>>> a['b'] = 'off'
>>> a.as_bool('b')
0

as_float

def as_float(self, key):

A convenience method which coerces the specified value to a float.

If the value is an invalid literal for float, a ValueError will be raised.

>>> a = ConfigObj()
>>> a['a'] = 'fish'
>>> a.as_float('a')
Traceback (most recent call last):
ValueError: invalid literal for float(): fish
>>> a['b'] = '1'
>>> a.as_float('b')
1.0
>>> a['b'] = '3.2'
>>> a.as_float('b')
3.2000000000000002

as_int

def as_int(self, key):

A convenience method which coerces the specified value to an integer.

If the value is an invalid literal for int, a ValueError will be raised.

>>> a = ConfigObj()
>>> a['a'] = 'fish'
>>> a.as_int('a')
Traceback (most recent call last):
ValueError: invalid literal for int(): fish
>>> a['b'] = '1'
>>> a.as_int('b')
1
>>> a['b'] = '3.2'
>>> a.as_int('b')
Traceback (most recent call last):
ValueError: invalid literal for int(): 3.2

clear

def clear(self):

A version of clear that also affects scalars/sections Also clears comments and configspec.

Leaves other attributes alone :
depth/main/parent are not affected

decode

def decode(self, encoding):

Decode all strings and values to unicode, using the specified encoding.

Works with subsections and list values.

Uses the walk method.

Testing encode and decode. >>> m = ConfigObj(a) >>> m.decode('ascii') >>> def testuni(val): ... for entry in val: ... if not isinstance(entry, unicode): ... print >> sys.stderr, type(entry) ... raise AssertionError, 'decode failed.' ... if isinstance(val[entry], dict): ... testuni(val[entry]) ... elif not isinstance(val[entry], unicode): ... raise AssertionError, 'decode failed.' >>> testuni(m) >>> m.encode('ascii') >>> a == m 1

dict

def dict(self):

Return a deepcopy of self as a dictionary.

All members that are Section instances are recursively turned to ordinary dictionaries - by calling their dict method.

>>> n = a.dict()
>>> n == a
1
>>> n is a
0

encode

def encode(self, encoding):

Encode all strings and values from unicode, using the specified encoding.

Works with subsections and list values. Uses the walk method.

get

def get(self, key, default=None):

A version of get that doesn't bypass string interpolation.

istrue

def istrue(self, key):

A deprecated version of as_bool.

items

def items(self):

iteritems

def iteritems(self):

iterkeys

def iterkeys(self):

itervalues

def itervalues(self):

keys

def keys(self):

merge

def merge(self, indict):

A recursive update - useful for merging config files.

>>> a = '''[section1]
...     option1 = True
...     [[subsection]]
...     more_options = False
...     # end of file'''.splitlines()
>>> b = '''# File is user.ini
...     [section1]
...     option1 = False
...     # end of file'''.splitlines()
>>> c1 = ConfigObj(b)
>>> c2 = ConfigObj(a)
>>> c2.merge(c1)
>>> c2
{'section1': {'option1': 'False', 'subsection': {'more_options': 'False'}}}

pop

def pop(self, key, *args):

popitem

def popitem(self):

Pops the first (key,val)

rename

def rename(self, oldkey, newkey):

Change a keyname to another, without changing position in sequence.

Implemented so that transformations can be made on keys, as well as on values. (used by encode and decode)

Also renames comments.

setdefault

def setdefault(self, key, default=None):

A version of setdefault that sets sequence if appropriate.

update

def update(self, indict):

A version of update that uses our __setitem__.

values

def values(self):

walk

def walk(self, function, raise_errors=True, call_on_sections=False, **keywargs):

Walk every member and call a function on the keyword and value.

Return a dictionary of the return values

If the function raises an exception, raise the errror unless raise_errors=False, in which case set the return value to False.

Any unrecognised keyword arguments you pass to walk, will be pased on to the function you pass in.

Note: if call_on_sections is True then - on encountering a subsection, first the function is called for the whole subsection, and then recurses into it's members. This means your function must be able to handle strings, dictionaries and lists. This allows you to change the key of subsections as well as for ordinary members. The return value when called on the whole subsection has to be discarded.

See the encode and decode methods for examples, including functions.

Caution!

You can use walk to transform the names of members of a section but you mustn't add or delete members.

>>> config = '''[XXXXsection]
... XXXXkey = XXXXvalue'''.splitlines()
>>> cfg = ConfigObj(config)
>>> cfg
{'XXXXsection': {'XXXXkey': 'XXXXvalue'}}
>>> def transform(section, key):
...     val = section[key]
...     newkey = key.replace('XXXX', 'CLIENT1')
...     section.rename(key, newkey)
...     if isinstance(val, (tuple, list, dict)):
...         pass
...     else:
...         val = val.replace('XXXX', 'CLIENT1')
...         section[newkey] = val
>>> cfg.walk(transform, call_on_sections=True)
{'CLIENT1section': {'CLIENT1key': None}}
>>> cfg
{'CLIENT1section': {'CLIENT1key': 'CLIENT1value'}}

Class SimpleVal

class SimpleVal(object):
    def __init__(self):

A simple validator. Can be used to check that all members expected are present.

To use it, provide a configspec with all your members in (the value given will be ignored). Pass an instance of SimpleVal to the validate method of your ConfigObj. validate will return True if all members are present, or a dictionary with True/False meaning present/missing. (Whole missing sections will be replaced with False)

Methods

check

def check(self, check, member, missing=False):

A dummy check method, always returns the value unchanged.

Class TemplateInterpolation

class TemplateInterpolation(InterpolationEngine):

Behaves like string.Template.

Class UnknownType

class UnknownType(Exception):

Class UnreprError

class UnreprError(ConfigObjError):

An error parsing in unrepr mode.