How to convert a file into a dictionary

Question

I have a file comprising two columns  i e    1 a  2 b  3 c   I wish to read this file to a dictionary such that column 1 is the key and column 2 is the value  i e     d    1  a   2  b   3  c     The file is small  so efficiency is not an issue

User · Answer

By dictionary comprehension       d     line split   0    line split   1  for line in open  file txt       Or By pandas  import pandas as pd  d   pd read csv  file txt   delimiter      header   None  to dict   0

User · Answer

Simple Option  Most methods for storing a dictionary use JSON  Pickle  or line reading   Providing you re not editing the dictionary outside of Python  this simple method should suffice for even complex dictionaries   Although Pickle will be better for larger dictionaries   x    1  a   2  b   3  c   f    file txt  print x  file open f  w         file txt  gt  gt  gt   1  a   2  b   3  c   y   eval open f  r   read    print x  y                       gt  gt  gt  True

User · Answer

I had a requirement to take values from text file and use as key value pair  i have content in text file as key   value  so i have used split method with separator as  quot   quot  and wrote below code d      file   open  quot filename txt quot   for x in file      f   x split  quot   quot       d update  f 0  strip    f 1  strip      By using strip method any spaces before or after the  quot   quot  separator are removed and you will have the expected data in dictionary format

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d      with open  file txt   as f      for line in f          key  val    line split          d int key     val

User · Answer

This will leave the key as a string   with open  infile txt   as f    d   dict x rstrip   split None  1  for x in f

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IMHO a bit more pythonic to use generators  probably you need 2 7  for this    with open  infile txt   as fd      pairs    line split None  for line in fd      res      int pair 0   pair 1  for pair in pairs if len pair     2 and pair 0  isdigit      This will also filter out lines not starting with an integer or not containing exactly two items

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If you love one liners  try   d eval     re sub      s               re sub r      input  SEP                 r  1       open input  FILE      read   rstrip   n   replace   n                Input FILE   Path to file  SEP   Key-Value separator character  Not the most elegant or efficient way of doing it  but quite interesting nonetheless

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Here s another option     events      for line in csv reader open os path join path   events txt     rb         if line 0  0                  continue     events line 0     line 1  if len line     2 else line 1

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def get pair line       key  sep  value   line strip   partition          return int key   value  with open  file txt   as fd          d   dict get pair line  for line in fd

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import re  my file   open  file txt   r   d      for i in my file    g   re search r   d   s        i    glob line containing an int and a string   d int g group 1      g group 2

User · Answer

You can also use a dict comprehension like  with open  quot infile txt quot   as f      d    int k   v for line in f for  k  v  in  line strip   split None  1

[python] How to convert a file into a dictionary?

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