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To filter and list files according to their names with Pathlib Python Module, we need to use the “glob()” function. “glob()” function is being used for determining patterns to filter the files according to their names or extension.
listdir() method returns a list of every file and folder in a directory. os. walk() function returns a list of every file in an entire file tree.
OS. walk() generate the file names in a directory tree by walking the tree either top-down or bottom-up. For each directory in the tree rooted at directory top (including top itself), it yields a 3-tuple (dirpath, dirnames, filenames).
walk() never changes the current directory, and assumes that its caller doesn't either.
files = [ fi for fi in files if not fi.endswith(".dat") ]
Exclude multiple extensions.
files = [ file for file in files if not file.endswith( ('.dat','.tar') ) ]
And in one more way, because I just wrote this, and then stumbled upon this question:
files = filter(lambda file: not file.endswith('.txt'), files)
Mote that in python3 filter returns a generator, not a list, and the list comprehension is "preferred".
A concise way of writing it, if you do this a lot:
def exclude_ext(ext):
def compare(fn): return os.path.splitext(fn)[1] != ext
return compare
files = filter(exclude_ext(".dat"), files)
Of course, exclude_ext goes in your appropriate utility package.
files = [file for file in files if os.path.splitext(file)[1] != '.dat']
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