Python Tip: Get Filename, Extension, Parent Folder, File Existence, and More

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From time to time, a very common task might be to get the file name, extension, parent folder, or checking the exitance of a file or file list. In Python, this can be done by the in-built os.path library. Here is how!

import os
# check interested files
is_file = lambda x: os.path.isfile(x)
# check if all the files in the input list exist
is_files = lambda x: all([is_file(y) for y in x]) if isinstance(x,list) else is_file(x)

# get file name
get_filename = lambda x: os.path.splitext(os.path.basename(x))[0]
# get file extension
get_file_ext = lambda x: os.path.splitext(os.path.basename(x))[-1]
# get the path of the file
get_dir_name = lambda x: os.path.dirname(x)
# get he parent folder name of the file
get_parent_dir_name = lambda x: os.path.basename(os.path.dirname(x))