Renaming file extension using pathlib (python 3)

You have to actually rename the file not just print out the new name.

1. Use Path.rename()

    from pathlib import Path
    my_file = Path("E:\\seaborn_plot\\x.dwt")
    my_file.rename(my_file.with_suffix('.txt'))
   

Note: To replace the target if it exists use Path.replace()

2. Use os.rename()

    import os
    my_file = 'E:\\seaborn_plot\\x.dwt'
    new_ext = '.txt'
    # Gets my_file minus the extension
    name_without_ext = os.path.splitext(my_file)[0]
    os.rename(my_file, name_without_ext + new_ext)
   

Ref:

1. os.path.splitext(path)
2. PurePath.with_suffix(suffix)

From the docs:

Path.rename(target)

Rename this file or directory to the given target. On Unix, if target exists and is a file, it will be replaced silently if the user has permission. target can be either a string or another path object.

^{pathlib — Object-oriented filesystem paths on docs.python.org}

You could use it like this:

from pathlib import Path


filename = Path("E:\\seaborn_plot\\x.dwt")
filename_replace_ext = filename.with_suffix(".txt")
filename.rename(filename_replace_ext)