Remove Duplicates from Text File

Question

I want to remove duplicate word from a text file.

i have some text file which contain such like following:

None_None

ConfigHandler_56663624
ConfigHa         


        

Answer 1

Here's about option that preserves order (unlike a set), but still has the same behaviour (note that the EOL character is deliberately stripped and blank lines are ignored)...

from collections import OrderedDict

with open('/home/jon/testdata.txt') as fin:
    lines = (line.rstrip() for line in fin)
    unique_lines = OrderedDict.fromkeys( (line for line in lines if line) )

print unique_lines.keys()
# ['None_None', 'ConfigHandler_56663624', 'ColumnConverter_56963312',PredicatesFactory_56963424', 'PredicateConverter_56963648', 'ConfigHandler_80134888']

Then you just need to write the above to your output file.

Answer 2

Here's how you can do it with sets (unordered results):

from pprint import pprint

with open('input.txt', 'r') as f:
    print pprint(set(f.readlines()))

Additionally you may want to get rid of new line chars.

Answer 3

this way get same file out that was put in

import uuid

def _remove_duplicates(filePath):
  f = open(filePath, 'r')
  lines = f.readlines()
  lines_set = set(lines)
  tmp_file=str(uuid.uuid4())
  out=open(tmp_file, 'w')
  for line in lines_set:
    out.write(line)
  f.close()
  os.rename(tmp_file,filePath)

Answer 4

Here is a simple solution using sets to remove the duplicates from the text file.

lines = open('workfile.txt', 'r').readlines()

lines_set = set(lines)

out  = open('workfile.txt', 'w')

for line in lines_set:
    out.write(line)

Answer 5

If you just want to get un-duplicate output , you can use uniq and sort

hvn@lappy: /tmp () $ sort -nr dup | uniq
PredicatesFactory_56963424
PredicateConverter_56963648
None_None
ConfigHandler_80134888
ConfigHandler_56663624
ColumnConverter_56963312

For python:

In [2]: with open("dup", 'rt') as f:
    lines = f.readlines()
   ...:     

In [3]: lines
Out[3]: 
['None_None\n',
 '\n',
 'ConfigHandler_56663624\n',
 'ConfigHandler_56663624\n',
 'ConfigHandler_56663624\n',
 'ConfigHandler_56663624\n',
 '\n',
 'None_None\n',
 '\n',
 'ColumnConverter_56963312\n',
 'ColumnConverter_56963312\n',
 '\n',
 'PredicatesFactory_56963424\n',
 'PredicatesFactory_56963424\n',
 '\n',
 'PredicateConverter_56963648\n',
 'PredicateConverter_56963648\n',
 '\n',
 'ConfigHandler_80134888\n',
 'ConfigHandler_80134888\n',
 'ConfigHandler_80134888\n',
 'ConfigHandler_80134888\n']

In [4]: set(lines)
Out[4]: 
set(['ColumnConverter_56963312\n',
     '\n',
     'PredicatesFactory_56963424\n',
     'ConfigHandler_56663624\n',
     'PredicateConverter_56963648\n',
     'ConfigHandler_80134888\n',
     'None_None\n'])

Answer 6

def remove_duplicates(infile):
    storehouse = set()
    with open('outfile.txt', 'w+') as out:
        for line in open(infile):
            if line not in storehouse:
                out.write(line)
                storehouse.add(line)

remove_duplicates('infile.txt')