iterpath 0.4.1

Iterate through a file tree

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iterpath lets you iterate over a file tree as a single iterator of pathlib.Path objects, eliminating the need to combine lists returned by os.walk() or recursively call Path.iterdir() or os.scandir(). Besides the standard os.walk() options, the library also includes options for sorting & filtering entries.

Installation

iterpath requires Python 3.8 or higher. Just use pip for Python 3 (You have pip, right?) to install it:

python3 -m pip install iterpath

Example

Iterate over this library’s source repository, skipping the .git and test/data folders:

>>> import os.path
>>> from iterpath import iterpath
>>> def filterer(dir_entry):
...     if dir_entry.name == ".git":
...         return False
...     elif dir_entry.path == os.path.join(".", "test", "data"):
...         return False
...     else:
...         return True
...
>>> with iterpath(".", sort=True, filter_dirs=filterer) as ip:
...     for p in ip:
...         print(p)
...
.github
.github/workflows
.github/workflows/test.yml
.gitignore
LICENSE
MANIFEST.in
README.rst
TODO.md
pyproject.toml
setup.cfg
src
src/iterpath
src/iterpath/__init__.py
src/iterpath/__pycache__
src/iterpath/__pycache__/__init__.cpython-39.pyc
src/iterpath/py.typed
test
test/test_iterpath.py
tox.ini

API

The iterpath module provides a single function, also named iterpath:

iterpath(dirpath: AnyStr | os.PathLike[AnyStr] = os.curdir, **kwargs) -> Iterpath[AnyStr]

Iterate through the file tree rooted at the directory dirpath (by default, the current directory) in depth-first order, yielding the files & directories within as pathlib.Path instances.

The return value is both an iterator and a context manager. In order to ensure that the internal os.scandir() iterators are closed properly, either call the close() method when done or else use it as a context manager like so:

with iterpath(...) as ip:
    for path in ip:
        ...

If return_relative is true, the generated Path objects will be relative to dirpath. If return_relative is false (the default) and dirpath is an absolute path, the generated Path objects will be absolute; otherwise, if dirpath is a relative path, the Path objects will be relative and will have dirpath as a prefix.

Note that, although iterpath() yields pathlib.Path objects, it operates internally on os.DirEntry objects, and so any function supplied as the sort_key parameter or as a filter/exclude parameter must accept os.DirEntry instances.

Keyword arguments:

dirs: bool = True

Whether to include directories in the output

topdown: bool = True

Whether to yield each directory before (True) or after (False) its contents

include_root: bool = False

Whether to include the dirpath argument passed to iterpath() in the output

followlinks: bool = False

Whether to treat a symlink to a directory as a directory

return_relative: bool = False

If true, the generated paths will be relative to dirpath

onerror: Optional[Callable[[OSError], Any]] = None

Specify a function to be called whenever an OSError is encountered while iterating over a directory. If the function reraises the exception, iterpath() aborts; otherwise, it continues with the next directory. By default, OSError exceptions are ignored.

sort: bool = False

Sort the entries in each directory. When False, entries are yielded in the order returned by os.scandir(). When True, entries are sorted, by default, by filename in ascending order, but this can be changed via the sort_key and sort_reverse arguments.

sort_key: Optional[Callable[[os.DirEntry[AnyStr]], _typeshed.SupportsLessThan]] = None

Specify a custom key function for sorting directory entries. Only has an effect when sort is True.

sort_reverse: bool = False

Sort directory entries in reverse order. Only has an effect when sort is True.

filter: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all files & directories encountered; only those for which the predicate returns a true value will be yielded (and, for directories, descended into).

If filter is specified, it is an error to also specify filter_dirs or filter_files.

filter_dirs: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all directories encountered; only those for which the predicate returns a true value will be yielded & descended into

filter_files: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all files encountered; only those for which the predicate returns a true value will be yielded

exclude: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all files & directories encountered; only those for which the predicate returns a false value will be yielded (and, for directories, descended into).

If exclude is specified, it is an error to also specify exclude_dirs or exclude_files.

exclude_dirs: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all directories encountered; only those for which the predicate returns a false value will be yielded & descended into

exclude_files: Optional[Callable[[os.DirEntry[AnyStr]], Any]] = None

Specify a predicate to be applied to all files encountered; only those for which the predicate returns a false value will be yielded

If both filter and exclude are set, a given entry will only be included if filter returns true and exclude returns false (that is, exclusions take priority over inclusions), and likewise for the directory- and file-specific arguments.

Warnings:

• If dirpath is a relative path, changing the working directory while iterpath() is in progress will lead to errors, or at least inaccurate results.

• Setting followlinks to True can result in infinite recursion if a symlink points to a parent directory of itself.

Selectors

New in version 0.3.0

iterpath also provides a selection of “selector” classes & constants for easy construction of filter and exclude arguments. Selectors are callables that return true for DirEntry’s whose (base) names match given criteria.

Selectors can even be combined using the | operator:

# This only returns entries whose names end in ".txt" or equal "foo.png" or
# ".hidden":
iterpath(
    dirpath,
    filter=SelectGlob("*.txt") | SelectNames("foo.png", ".hidden")
)

# Exclude all dot-directories and VCS directories:
iterpath(dirpath, exclude_dirs=SELECT_DOTS | SELECT_VCS_DIRS)

The selectors:

class SelectNames(*names: AnyStr, case_sensitive: bool = True)

Selects DirEntry’s whose names are one of names. If case_sensitive is False, the check is performed case-insensitively.

class SelectGlob(pattern: AnyStr)

Selects DirEntry’s whose names match the given fileglob pattern

class SelectRegex(pattern: AnyStr | re.Pattern[AnyStr])

Selects DirEntry’s whose names match (using re.search()) the given regular expression

SELECT_DOTS

Selects DirEntry’s whose names begin with a period

SELECT_VCS

Selects DirEntry’s matched by either SELECT_VCS_DIRS or SELECT_VCS_FILES (see below)

SELECT_VCS_DIRS

Selects the following names of version-control directories: .git, .hg, _darcs, .bzr, .svn, _svn, CVS, RCS

SELECT_VCS_FILES

Selects the following names of version-control-specific files: .gitattributes, .gitignore, .gitmodules, .mailmap, .hgignore, .hgsigs, .hgtags, .binaries, .boring, .bzrignore, and all nonempty filenames that end in ,v