Issue
I have downloaded a CSV file from Hotmail, but it has a lot of duplicates in it. These duplicates are complete copies and I don't know why my phone created them.
I want to get rid of the duplicates.
Technical specification:
Windows XP SP 3 Python 2.7 CSV file with 400 contacts
Solution
UPDATE: 2016
If you are happy to use the helpful more_itertools
external library:
from more_itertools import unique_everseen
with open('1.csv', 'r') as f, open('2.csv', 'w') as out_file:
out_file.writelines(unique_everseen(f))
A more efficient version of @IcyFlame's solution
with open('1.csv', 'r') as in_file, open('2.csv', 'w') as out_file:
seen = set() # set for fast O(1) amortized lookup
for line in in_file:
if line in seen: continue # skip duplicate
seen.add(line)
out_file.write(line)
To edit the same file in-place you could use this (Old Python 2 code)
import fileinput
seen = set() # set for fast O(1) amortized lookup
for line in fileinput.FileInput('1.csv', inplace=1):
if line in seen: continue # skip duplicate
seen.add(line)
print line, # standard output is now redirected to the file
Answered By - jamylak Answer Checked By - Pedro (PHPFixing Volunteer)
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