Writing a dictionary to a text file

Question

I have a dictionary and am trying to write it to a file   exDict    1 1  2 2  3 3  with open  file txt    r   as file      file write exDict    I then have the error  file write exDict  TypeError  must be str  not dict   So I fixed that error but another error came  exDict    111 111  222 222  with open  file txt    r   as file      file write str exDict     The error   file write str exDict   io UnsupportedOperation  not writable   I have no idea what to do as I am still a beginner at python  If anyone knows how to resolve the issue  please provide an answer   NOTE  I am using python 3  not python 2

User · Answer

fout     your outfile here txt  fo   open fout   w    for k  v in yourDictionary items        fo write str k       gt  gt  gt     str v      n n    fo close

User · Answer

For list comprehension lovers  this will write all the key   value pairs in new lines in dog txt  my dict     foo    1 2    bar   3 4      create list of strings list of strings     f  key     my dict key    for key in my dict      write string one by one adding newline with open  dog txt    w   as my file        my file write f  st  n   for st in list of strings

User · Answer

First of all you are opening file in read mode and trying to write into it  Consult - IO modes python  Secondly  you can only write a string to a file  If you want to write a dictionary object  you either need to convert it into string or serialize it   import json    as requested in comment exDict     exDict   exDict   with open  file txt    w   as file       file write json dumps exDict     use  json loads  to do the reverse   In case of serialization  import cPickle as pickle  with open  file txt    w   as file       file write pickle dumps exDict     use  pickle loads  to do the reverse   For python 3 x pickle package import would be different  import  pickle as pickle

User · Answer

I know this is an old question but I also thought to share a solution that doesn t involve json  I don t personally quite like json because it doesn t allow to easily append data  If your starting point is a dictionary  you could first convert it to a dataframe and then append it to your txt file   import pandas as pd one line dict   exDict    1 1  2 2  3 3  df   pd DataFrame from dict  one line dict   df to csv  file txt   header False  index True  mode  a     I hope this could help

User · Answer

The probelm with your first code block was that you were opening the file as  r  even though you wanted to write to it using  w   with open   Users your path foo   w   as data      data write str dictionary

User · Answer

import json  with open  tokenler json    w   as file       file write json dumps mydict  ensure ascii False

User · Answer

exDict    1 1  2 2  3 3  with open  file txt    w    as file      file write str exDict

User · Answer

You can do as follow     import json exDict    1 1  2 2  3 3  file write json dumps exDict     https   developer rhino3d com guides rhinopython python-xml-json

User · Answer

If you want a dictionary you can import from a file by name  and also that adds entries that are nicely sorted  and contains strings you want to preserve  you can try this   data     A    a    B    b      with open  file py   w   as file      file write  dictionary name      n       for k in sorted  data keys             file write    s    s    n     k  data k        file write        Then to import   from file import dictionary name

User · Answer

I do it like this in python 3   with open  myfile txt    w   as f      print mydictionary  file f

[python-3.x] Writing a dictionary to a text file?

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