How to read and write INI file with Python3

Question

I need to read  write and create an INI file with Python3   FILE INI  default path     path name   default file    file txt    Python File        Read file and and create if it not exists config   iniFile   FILE INI          Get  default path  config default path       Print  string  path name print config default path       Create or Update config append   default path    var shared     config append   default message    Hey  help me        UPDATED FILE INI  default path       var shared   default file       file txt  default message    Hey  help me

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http   docs python org library configparser html  Python s standard library might be helpful in this case

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Use nested dictionaries  Take a look  INI File  example ini  Section  Key   Value  Code  class IniOpen      def   init   self  file           self parse              self file   file         self open   open file   quot r quot           self f read   self open read           split content   self f read split  quot  n quot            section    quot  quot          pairs    quot  quot           for i in range len split content                if split content i  find  quot   quot      -1                  section   split content i                  section   string between section   quot   quot    quot   quot      define your own function                 self parse update  section                   elif split content i  find  quot   quot      -1 and split content i  find  quot   quot                    pairs   split content i                  split pairs   pairs split  quot   quot                   key   split pairs 0  trim                   value   split pairs 1  trim                   self parse section  update  key  value        def read self  section  key           try              return self parse section  key          except KeyError              return  quot Sepcified Key Not Found  quot       def write self  section  key  value           if self parse get section  is  None              self parse update  section               elif self parse get section  is not None              if self parse section  get key  is None                  self parse section  update  key  value               elif self parse section  get key  is not None                  return  quot Content Already Exists quot   Apply code like so  ini file   IniOpen  quot example ini quot   print ini file parse    prints the entire nested dictionary print ini file read  quot Section quot    quot Key quot      gt  gt  Returns Value ini file write  quot NewSection quot    quot NewKey quot    quot New Value quot

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ConfigObj is a good alternative to ConfigParser which offers a lot more flexibility    Nested sections  subsections   to any level List values Multiple line values String interpolation  substitution  Integrated with a powerful validation system including automatic type checking conversion repeated sections and allowing default values When writing out config files  ConfigObj preserves all comments and the order of members and sections Many useful methods and options for working with configuration files  like the  reload  method  Full Unicode support   It has some draw backs    You cannot set the delimiter  it has to be       pull request  You cannot have empty values  well you can but they look liked  fuabr   instead of just fubar which looks weird and wrong

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This can be something to start with   import configparser  config   configparser ConfigParser   config read  FILE INI   print config  DEFAULT    path          - gt    path name   config  DEFAULT    path       var shared        update config  DEFAULT    default message      Hey  help me        create  with open  FILE INI    w   as configfile       save     config write configfile    You can find more at the official configparser documentation

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The standard ConfigParser normally requires access via config  section name    key    which is no fun  A little modification can deliver attribute access   class AttrDict dict       def   init   self   args    kwargs           super AttrDict  self    init    args    kwargs          self   dict     self   AttrDict is a class derived from dict which allows access via both dictionary keys and attribute access  that means a x is a  x    We can use this class in ConfigParser   config   configparser ConfigParser dict type AttrDict  config read  application ini     and now we get application ini with    general  key   value   as   gt  gt  gt  config  sections general key  value

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Here s a complete read  update and write example   Input file  test ini   section a  string val   hello bool val   false int val   11 pi val   3 14   Working code   try      from configparser import ConfigParser except ImportError      from ConfigParser import ConfigParser    ver   lt  3 0    instantiate config   ConfigParser      parse existing file config read  test ini      read values from a section string val   config get  section a    string val   bool val   config getboolean  section a    bool val   int val   config getint  section a    int val   float val   config getfloat  section a    pi val      update existing value config set  section a    string val    world      add a new section and some values config add section  section b   config set  section b    meal val    spam   config set  section b    not found val    404      save to a file with open  test update ini    w   as configfile      config write configfile    Output file  test update ini   section a  string val   world bool val   false int val   11 pi val   3 14   section b  meal val   spam not found val   404   The original input file remains untouched

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There are some problems I found when used configparser such as - I got an error when I tryed to get value from param  destination  my-server backup  USERNAME  It was because parser can t get this value with special character      And then I wrote a parser for reading ini files based on  re  module  import re    read from ini file  def ini read ini file  key       value   None     with open ini file   r   as f          for line in f              match   re match r        key               line  re M   re I              if match                  value   match group                   value   re sub r        key                value                  break     return value     read value for a key  destination  from  c  myconfig ini  my value 1   ini read  c  myconfig ini    destination      read value for a key  create destination folder  from  c  myconfig ini  my value 2   ini read  c  myconfig ini    create destination folder       write to an ini file  def ini write ini file  key  value  add new False       line number   0     match found   False     with open ini file   r   as f          lines   f read   splitlines       for line in lines          if re match r        key               line  re M   re I               match found   True             break         line number    1     if match found          lines line number    key           value         with open ini file   w   as f              for line in lines                  f write line     n           return True     elif add new          with open ini file   a   as f              f write key           value          return True     return False     change a value for a key  destination   ini write  my config ini    destination      server backups   USERNAME       change a value for a key  create destination folder  ini write  my config ini    create destination folder    True      to add a new key  we need to use  add new True  option  ini write  my config ini    extra new param    True   True

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contents in my backup settings ini file   Settings  year   2020   python code for reading   import configparser config   configparser ConfigParser   config read  backup settings ini    path of your  ini file year   config get  Settings   year    print year    for writing or updating   from pathlib import Path import configparser myfile   Path  backup settings ini     Path of your  ini file config read myfile  config set  Settings    year   2050    Updating existing entry  config set  Settings    day   sunday    Writing new entry config write myfile open  w      output    Settings  year   2050 day   sunday

[python] How to read and write INI file with Python3?

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