Changing file extension in Python

Question

Suppose from index py with CGI  I have post file foo fasta to display file  I want to change foo fasta s file extension to be foo aln in display file  How can I do it

User · Answer

Starting from Python 3 4 there s pathlib built-in library  So the code could be something like   from pathlib import Path  filename    mysequence fasta  new filename   Path filename  stem     aln    https   docs python org 3 4 library pathlib html pathlib PurePath stem  I love pathlib

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As AnaPana mentioned pathlib is more new and easier in python 3 4 and there is new with suffix method that can handle this problem easily   from pathlib import Path new filename   Path mysequence fasta  with suffix   aln

User · Answer

Using pathlib and preserving full path   from pathlib import Path p   Path   User my path   new p   Path p parent as posix           p stem     aln

User · Answer

Sadly  I experienced a case of multiple dots on file name that splittext does not worked well    my work around  file   r C  Docs file 2020 1 1 xls  ext        os path realpath file  split      -1   0  filefinal   file replace ext   zip   os rename file  filefinal

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An elegant way using pathlib Path   from pathlib import Path p   Path  mysequence fasta   p rename p with suffix   aln

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import os thisFile    mysequence fasta  base   os path splitext thisFile  0  os rename thisFile  base     aln     Where thisFile   the absolute path of the file you are changing

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os path splitext    os rename    for example     renamee is the file getting renamed  pre is the part of file name before extension and ext is current extension pre  ext   os path splitext renamee  os rename renamee  pre   new extension

User · Answer

Use this   os path splitext  name fasta   0    aln    And here is how the above works   The splitext method separates the name from the extension creating a tuple   os path splitext  name fasta     the created tuple now contains the strings  name  and  fasta   Then you need to access only the string  name  which is the first element of the tuple   os path splitext  name fasta   0    And then you want to add a new extension to that name   os path splitext  name fasta   0    aln

User · Answer

gt  gt  file   r C  Docs file 2020 1 1 xls   gt  gt  ext        os path realpath file  split      -1   0   gt  gt  filefinal   file replace ext   zip    gt  gt  os rename file  filefinal    Bad logic for repeating extension  sample   C  Docs  xls aaa xls xls

[python] Changing file extension in Python

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