Skip the headers when editing a csv file using Python

Question

I am using below referred code to edit a csv using Python  Functions called in the code form upper part of the code    Problem  I want the below referred code to start editing the csv from 2nd row  I want it to exclude 1st row which contains headers  Right now it is applying the functions on 1st row only and my header row is getting changed   in file   open  tmob notcleaned csv    rb   reader   csv reader in file  out file   open  tmob cleaned csv    wb   writer   csv writer out file  row   1 for row in reader      row 13    handle color row 10   1  replace   -       strip       row 10    handle color row 10   0  replace  -      replace         replace         strip       row 14    handle gb row 10   1  replace  -      replace         replace  GB      strip       row 10    handle gb row 10   0  strip       row 9    handle oem row 10   1  replace  Blackberry   RIM   replace  TMobile   T-Mobile   strip       row 15    handle addon row 10   1  strip       row 10    handle addon row 10   0  replace   by      replace  FREE      strip       writer writerow row  in file close       out file close     I tried to solve this problem by initializing row variable to 1 but it didn t work   Please help me in solving this issue

User · Answer

Doing row 1 won t change anything  because you ll just overwrite that with the results of the loop   You want to do next reader  to skip one row

User · Answer

Inspired by Martijn Pieters  response  In case you only need to delete the header from the csv file  you can work more efficiently if you write using the standard Python file I O library  avoiding writing with the CSV Python library  with open  quot tmob notcleaned csv quot    quot rb quot   as infile  open  quot tmob cleaned csv quot    quot wb quot   as outfile     next infile     skip the headers    outfile write infile read

User · Answer

Another way of solving this is to use the DictReader class  which  skips  the header row and uses it to allowed named indexing   Given  foo csv  as follows   FirstColumn SecondColumn asdf 1234 qwer 5678   Use DictReader like this   import csv with open  foo csv   as f      reader   csv DictReader f  delimiter          for row in reader          print row  FirstColumn       Access by column header instead of column number         print row  SecondColumn

User · Answer

Your reader variable is an iterable  by looping over it you retrieve the rows   To make it skip one item before your loop  simply call next reader  None  and ignore the return value   You can also simplify your code a little  use the opened files as context managers to have them closed automatically   with open  tmob notcleaned csv    rb   as infile  open  tmob cleaned csv    wb   as outfile     reader   csv reader infile     next reader  None     skip the headers    writer   csv writer outfile     for row in reader           process each row        writer writerow row     no need to close  the files are closed automatically when you get to this point    If you wanted to write the header to the output file unprocessed  that s easy too  pass the output of next   to writer writerow     headers   next reader  None     returns the headers or  None  if the input is empty if headers      writer writerow headers

[python] Skip the headers when editing a csv file using Python

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