Example 1: Using splitext() method from os module
import os
file_details = os.path.splitext('/path/file.ext')
print(file_details)
print(file_details[1])
Output
('/path/file', '.ext')
.ext
os.path.splitext() gives a tuple with one item as the name of the file along with the path and the other is the extension of the file. If you want the file extension only, you can print it as shown above file_details[1].
Example 2: Using pathlib module
import pathlib
print(pathlib.Path('/path/file.ext').suffix)
Output
.ext
Using suffix attribute from pathlib module, we can get the extension of a file. In the above example, .ext is the extension of file file.ext.
Note: It works for python 3.4 and above.