Using Python's ConfigParser to read a file wit

2019-01-06 11:39发布

I am using ConfigParser to read the runtime configuration of a script.

I would like to have the flexibility of not providing a section name (there are scripts which are simple enough; they don't need a 'section'). ConfigParser will throw the NoSectionError exception, and will not accept the file.

How can I make ConfigParser simply retrieve the (key, value) tuples of a config file without section names? For instance:

key1=val1
key2:val2

I would rather not write to the config file.

7条回答
Luminary・发光体
2楼-- · 2019-01-06 11:48

Having ran into this problem myself, I wrote a complete wrapper to ConfigParser (the version in Python 2) that can read and write files without sections transparently, based on Alex Martelli's approach linked on the accepted answer. It should be a drop-in replacement to any usage of ConfigParser. Posting it in case anyone in need of that finds this page.

import ConfigParser
import StringIO

class SectionlessConfigParser(ConfigParser.RawConfigParser):
    """
    Extends ConfigParser to allow files without sections.

    This is done by wrapping read files and prepending them with a placeholder
    section, which defaults to '__config__'
    """

    def __init__(self, *args, **kwargs):
        default_section = kwargs.pop('default_section', None)
        ConfigParser.RawConfigParser.__init__(self, *args, **kwargs)

        self._default_section = None
        self.set_default_section(default_section or '__config__')

    def get_default_section(self):
        return self._default_section

    def set_default_section(self, section):
        self.add_section(section)

        # move all values from the previous default section to the new one
        try:
            default_section_items = self.items(self._default_section)
            self.remove_section(self._default_section)
        except ConfigParser.NoSectionError:
            pass
        else:
            for (key, value) in default_section_items:
                self.set(section, key, value)

        self._default_section = section

    def read(self, filenames):
        if isinstance(filenames, basestring):
            filenames = [filenames]

        read_ok = []
        for filename in filenames:
            try:
                with open(filename) as fp:
                    self.readfp(fp)
            except IOError:
                continue
            else:
                read_ok.append(filename)

        return read_ok

    def readfp(self, fp, *args, **kwargs):
        stream = StringIO()

        try:
            stream.name = fp.name
        except AttributeError:
            pass

        stream.write('[' + self._default_section + ']\n')
        stream.write(fp.read())
        stream.seek(0, 0)

        return ConfigParser.RawConfigParser.readfp(self, stream, *args,
                                                   **kwargs)

    def write(self, fp):
        # Write the items from the default section manually and then remove them
        # from the data. They'll be re-added later.
        try:
            default_section_items = self.items(self._default_section)
            self.remove_section(self._default_section)

            for (key, value) in default_section_items:
                fp.write("{0} = {1}\n".format(key, value))

            fp.write("\n")
        except ConfigParser.NoSectionError:
            pass

        ConfigParser.RawConfigParser.write(self, fp)

        self.add_section(self._default_section)
        for (key, value) in default_section_items:
            self.set(self._default_section, key, value)
查看更多
一纸荒年 Trace。
3楼-- · 2019-01-06 11:50

The easiest way to do this is to use python's CSV parser, in my opinion. Here's a read/write function demonstrating this approach as well as a test driver. This should work provided the values are not allowed to be multi-line. :)

import csv
import operator

def read_properties(filename):
    """ Reads a given properties file with each line of the format key=value.  Returns a dictionary containing the pairs.

    Keyword arguments:
        filename -- the name of the file to be read
    """
    result={ }
    with open(filename, "rb") as csvfile:
        reader = csv.reader(csvfile, delimiter='=', escapechar='\\', quoting=csv.QUOTE_NONE)
        for row in reader:
            if len(row) != 2:
                raise csv.Error("Too many fields on row with contents: "+str(row))
            result[row[0]] = row[1] 
    return result

def write_properties(filename,dictionary):
    """ Writes the provided dictionary in key-sorted order to a properties file with each line of the format key=value

    Keyword arguments:
        filename -- the name of the file to be written
        dictionary -- a dictionary containing the key/value pairs.
    """
    with open(filename, "wb") as csvfile:
        writer = csv.writer(csvfile, delimiter='=', escapechar='\\', quoting=csv.QUOTE_NONE)
        for key, value in sorted(dictionary.items(), key=operator.itemgetter(0)):
                writer.writerow([ key, value])

def main():
    data={
        "Hello": "5+5=10",
        "World": "Snausage",
        "Awesome": "Possum"
    }

    filename="test.properties"
    write_properties(filename,data)
    newdata=read_properties(filename)

    print "Read in: "
    print newdata
    print

    contents=""
    with open(filename, 'rb') as propfile:
        contents=propfile.read()
    print "File contents:"
    print contents

    print ["Failure!", "Success!"][data == newdata]
    return

if __name__ == '__main__': 
     main() 
查看更多
祖国的老花朵
4楼-- · 2019-01-06 11:53

You can use the ConfigObj library to do that simply : http://www.voidspace.org.uk/python/configobj.html

Updated: Find latest code here.

If you are under Debian/Ubuntu, you can install this module using your package manager :

apt-get install python-configobj

An example of use:

from configobj import ConfigObj

config = ConfigObj('myConfigFile.ini')
config.get('key1') # You will get val1
config.get('key2') # You will get val2
查看更多
Deceive 欺骗
5楼-- · 2019-01-06 11:57

Enlightened by this answer by jterrace, I come up with this solution:

  1. Read entire file into a string
  2. Prefix with a default section name
  3. Use StringIO to mimic a file-like object
ini_str = '[root]\n' + open(ini_path, 'r').read()
ini_fp = StringIO.StringIO(ini_str)
config = ConfigParser.RawConfigParser()
config.readfp(ini_fp)


EDIT for future googlers: As of Python 3.4+ readfp is deprecated, and StringIO is not needed anymore. Instead we can use read_string directly:

with open('config_file') as f:
    file_content = '[dummy_section]\n' + f.read()

config_parser = RawConfigParser()
config_parser.read_string(file_content)
查看更多
一纸荒年 Trace。
6楼-- · 2019-01-06 11:59

Alex Martelli provided a solution for using ConfigParser to parse .properties files (which are apparently section-less config files).

His solution is a file-like wrapper that will automagically insert a dummy section heading to satisfy ConfigParser's requirements.

查看更多
Luminary・发光体
7楼-- · 2019-01-06 12:00

Blueicefield's answer mentioned configobj, but the original lib only supports Python 2. It now has a Python 3+ compatible port:

https://github.com/DiffSK/configobj

APIs haven't changed, see it's doc.

查看更多
登录 后发表回答