Extracting extension from filename in Python

Question

Is there a function to extract the extension from a filename

User · Answer

This is a direct string representation techniques   I see a lot of solutions mentioned  but I think most are looking at split  Split however does it at every occurrence of       What you would rather be looking for is partition   string    folder to path filename ext  extension   string rpartition      -1

User · Answer

You can use a split on a filename   f extns   filename split      print   The extension of the file is       repr f extns -1      This does not require additional library

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import os path extension   os path splitext filename  1  1     To get only the text of the extension  without the dot

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try this   files     file jpeg   file tar gz   file png   file foo bar   file etc   pen ext     foo    tar    bar    etc    for file in files   1     if  file split      -2  in pen ext    2         ext    file split      -2      file split      -1  3     else          ext   file split      -1   4     print  ext   5    get all file name inside the list splitting file name and check the penultimate extension  is it in the pen ext list or not  if yes then join it with the last extension and set it as the file s extension if not then just put the last extension as the file s extension and then check it out

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filename  ext tar gz  extension   filename filename rfind

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try this  it works for anything  any length of extension   e g www google com downloads file1 gz rs - gt   gz rs  import os path  class LinkChecker        staticmethod     def get link extension link  str - gt str          if link is None or link                    return            else              paths   os path splitext link              ext   paths 1              new link   paths 0              if ext                        return LinkChecker get link extension new link    ext             else                  return

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Surprised this wasn t mentioned yet   import os fn     some path a tar gz   basename   os path basename fn     os independent Out   a tar gz  base   basename split      0  Out   a  ext       join basename split      1         lt -- main part    if you want a leading      and if no result  None   ext         ext if ext else None Out    tar gz   Benefits    Works as expected for anything I can think of No modules No regex Cross-platform Easily extendible  e g  no leading dots for extension  only last part of extension    As function   def get extension filename       basename   os path basename filename     os independent     ext       join basename split      1        return       ext if ext else None

User · Answer

With splitext there are problems with files with double extension  e g  file tar gz  file tar bz2  etc      gt  gt  gt  fileName  fileExtension   os path splitext   path to somefile tar gz    gt  gt  gt  fileExtension    gz    but should be   tar gz  The possible solutions are here

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For simple use cases one option may be splitting from dot    gt  gt  gt  filename    example jpeg   gt  gt  gt  filename split      -1   jpeg    No error when file doesn t have an extension    gt  gt  gt   filename  split      -1   filename    But you must be careful    gt  gt  gt   png  split      -1   png       But file doesn t have an extension   Also will not work with hidden files in Unix systems    gt  gt  gt    bashrc  split      -1   bashrc       But this is not an extension   For general use  prefer os path splitext

User · Answer

import os path extension   os path splitext filename  1

User · Answer

worth adding a lower in there so you don t find yourself wondering why the JPG s aren t showing up in your list   os path splitext filename  1  1   strip   lower

User · Answer

Although it is an old topic  but i wonder why there is none mentioning a very simple api of python called rpartition in this case   to get extension of a given file absolute path  you can simply type   filepath rpartition      -1    example   path     home jersey remote data test csv  print path rpartition      -1    will give you    csv

User · Answer

For funsies    just collect the extensions in a dict  and track all of them in a folder   Then just pull the extensions you want    import os  search       for f in os listdir os getcwd         fn  fe   os path splitext f      try          search fe  append f      except          search fe   f    extensions      png    jpg   for ex in extensions      found   search get ex         if found          print found

User · Answer

name only file name  filename index        That will give you the file name up to the first      which would be the most common

User · Answer

Any of the solutions above work  but on linux I have found that there is a newline at the end of the extension string which will prevent matches from succeeding  Add the strip   method to the end  For example     import os path extension   os path splitext filename  1  1   strip

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def NewFileName fichier       cpt   0     fic    ext    fichier split          ext       join ext      while os path isfile fichier           cpt    1         fichier     0 -  1    2   format fic  cpt  ext      return fichier

User · Answer

Yes  Use os path splitext see Python 2 X documentation or Python 3 X documentation     gt  gt  gt  import os  gt  gt  gt  filename  file extension   os path splitext   path to somefile ext    gt  gt  gt  filename   path to somefile   gt  gt  gt  file extension   ext    Unlike most manual string-splitting attempts  os path splitext will correctly treat  a b c d as having no extension instead of having extension  c d  and it will treat  bashrc as having no extension instead of having extension  bashrc    gt  gt  gt  os path splitext   a b c d      a b c d        gt  gt  gt  os path splitext   bashrc      bashrc

User · Answer

This is The Simplest Method to get both Filename  amp  Extension in just a single line   fName  ext    C  folder name Flower jpeg  split      -1  split        gt  gt  gt  print fName  Flower  gt  gt  gt  print ext  jpeg   Unlike other solutions  you don t need to import any package for this

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You can find some great stuff in pathlib module  available in python 3 x    import pathlib x   pathlib PurePosixPath  C   Path  To  File  myfile txt   suffix print x     Output    txt

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New in version 3 4   import pathlib  print pathlib Path  yourPath example   suffix      example    I m surprised no one has mentioned pathlib yet  pathlib IS awesome   If you need all the suffixes  eg if you have a  tar gz    suffixes will return a list of them

User · Answer

Another solution with right split     to get extension only  s    test ext   if     in s  ext   s rsplit      1  1     or  to get file name and extension  def split filepath s               get filename and extension from filepath      filepath - gt   filename  extension              if not     in s  return  s          r   s rsplit      1      return  r 0   r 1

User · Answer

a    quot  bashrc quot  b    quot text txt quot  extension a   a split  quot   quot   extension b   b split  quot   quot   print extension a -1      bashrc print extension b -1      txt

User · Answer

A true one-liner  if you like regex   And it doesn t matter even if you have additional     in the middle  import re  file ext   re search r              filename  group 1    See here for the result  Click Here

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Even this question is already answered I d add the solution in Regex     gt  gt  gt  import re  gt  gt  gt  file suffix               gt  gt  gt  result   re search file suffix   somefile ext    gt  gt  gt  result group 1    ext

User · Answer

Just join all pathlib suffixes    gt  gt  gt  x    file path archive tar gz   gt  gt  gt  y    file path text txt   gt  gt  gt     join pathlib Path x  suffixes    tar gz   gt  gt  gt     join pathlib Path y  suffixes    txt

[python] Extracting extension from filename in Python

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