pathlibutil 0.2.0

inherits from pathlib.Path with methods for hashing, copying, deleting and more

pathlibutil

---

pathlibutil.Path inherits from pathlib.Path with some useful built-in python functions from shutil and hashlib

• Path.hexdigest() to calculate and Path.verify() for verification of hexdigest from a file
• Path.default_hash to configurate default hash algorithm for Path class (default: 'md5')
• Path.size() to get size in bytes of a file or directory
  • byteint function decorator converts the return value of int to a ByteInt object
• Path.read_lines() to yield over all lines from a file until EOF
• contextmanager to change current working directory with with statement
• Path.copy() copy a file or directory to a new path destination
• Path.delete() delete a file or directory-tree
• Path.move() move a file or directory to a new path destination
• Path.make_archive() creates and Path.unpack_archive() uncompresses an archive from a file or directory
• Path.archive_formats to get all available archive formats
• Path.stat() returns a StatResult object to get file or directory information containing
  • TimeInt objects for atime, ctime, mtime and birthtime
  • ByteInt object for size
• Path.relative_to() to get relative path from a file or directory, walk_up to walk up the directory tree.
• Path.with_suffix() to change the multiple suffixes of a file
• Path.cwd() to get the current working directory or executable path when script is bundled, e.g. with pyinstaller
• Path.resolve() to resolve a unc path to a mapped windows drive.
• Path.walk() to walk over a directory tree like os.walk()
• Path.iterdir() with recursive all files from the directory tree will be yielded and exclude_dirs via callable.

JSON serialization of Path objects is supported in pathlibutil.json.

• pathlibutil.json.dumps() and pathlibutil.json.dump() to serialize Path objects as posix paths.

Installation

pip install pathlibutil

7zip support

to handle 7zip archives, an extra package py7zr>=0.20.2 is required!

# install as extra dependency
pip install pathlibutil[7z]

Usage

from pathlibutil import Path

readme = Path('README.md')

print(f'File size: {readme.size()} Bytes')

Example 1

Read a file and print its content and some file information to stdout.

Path.read_lines()

from pathlibutil import Path

readme = Path("README.md")

print(f"File size: {readme.size()} Bytes")
print(f'File sha1: {readme.hexdigest("sha1")}')

print("File content".center(80, "="))

for line in readme.read_lines(encoding="utf-8"):
  print(line, end="")

print("EOF".center(80, "="))

Example 2

Write a file with md5 checksums of all python files in the pathlibutil-directory.

Path.hexdigest()

from pathlibutil import Path

file = Path("pathlibutil.md5")

with file.open("w") as f:
  f.write(
      f"# MD5 checksums generated with pathlibutil "
      "(https://pypi.org/project/pathlibutil/)\n\n"
  )

  i = 0
  for i, filename in enumerate(Path("./pathlibutil").glob("*.py"), start=1):
    f.write(f"{filename.hexdigest()} *{filename}\n")

print(f"\nwritten: {i:>5} {file.default_hash}-hashes to: {file}")

Example 3

Read a file with md5 checksums and verify them.

Path.verify(), Path.default_hash and contextmanager

from pathlibutil import Path

file = Path("pathlibutil.md5")


def no_comment(line: str) -> bool:
  return not line.startswith("#")


with file.parent as cwd:
  miss = 0
  ok = 0
  fail = 0

  for line in filter(no_comment, file.read_lines()):
    try:
      digest, filename = line.strip().split(" *")
      verification = Path(filename).verify(digest, "md5")
    except ValueError as split_failed:
      continue
    except FileNotFoundError as verify_failed:
      tag = "missing"
      miss += 1
    else:
      if verification:
        tag = "ok"
        ok += 1
      else:
        tag = "fail"
        fail += 1

    print(f'{tag.ljust(len(digest), ".")} *{filename}')

  print(f"\nok: {ok:<5} fail: {fail:<5} missing: {miss}")

Example 4

Search all pycache directories and free the memory and display the number of deleted directories and the amount of memory freed in MB.

Path.delete(), Path.size() and ByteInt

from pathlibutil import ByteInt, Path

mem = ByteInt(0)
i = 0

for i, cache in enumerate(Path(".").rglob("*/__pycache__/"), start=1):
  cache_size = cache.size()
  try:
    cache.delete(recursive=True)
  except OSError:
    print(f"Failed to delete {cache}")
  else:
    mem += cache_size

print(f"{i} cache directories deleted, {mem:.1mb} MB freed.")

Example 5

Inherit from pathlibutil.Path to register new a archive format. Specify a archive as keyword argument in the new subclass, which has to be the suffix without . of the archives. Implement a classmethod _register_archive_format() to register new archive formats.

Path.make_archive(), Path.archive_formats and Path.move()

import shutil

import pathlibutil


class RegisterFooBarFormat(pathlibutil.Path, archive="foobar"):
  @classmethod
  def _register_archive_format(cls):
    """
    implement new register functions for given `archive`
    """
    try:
      import required_package_name
    except ModuleNotFoundError:
      raise ModuleNotFoundError("pip install <required_package_name>")

    def pack_foobar(
        base_name, base_dir, owner=None, group=None, dry_run=None, logger=None
    ) -> str:
      """callable that will be used to unpack archives.

      Args:
          base_name (`str`): name of the file to create
          base_dir (`str`): directory to start archiving from, defaults to `os.curdir`
          owner (`Any`, optional): as passed in `make_archive(*args, owner=None, **kwargs)`. Defaults to None.
          group (`Any`, optional): as passed in `make_archive(*args, group=None, **kwargs)`. Defaults to None.
          dry_run (`Any`, optional): as passed in `make_archive(*args, dry_run=None, **kwargs)`. Defaults to None.
          logger (`logging.Logger`, optional): as passed in `make_archive(*args, logger=None, **kwargs)`. Defaults to None.

      Returns:
          str: path of the new created archive
      """
      raise NotImplementedError("implement your own pack function")

    def unpack_foobar(archive, path, filter=None, extra_args=None) -> None:
      """callable that will be used to unpack archives.

      Args:
          archive (`str`): path of the archive
          path (`str`): directory the archive must be extracted to
          filter (`Any`, optional): as passed in `unpack_archive(*args, filter=None, **kwargs)`. Defaults to None.
          extra_args (`Sequence[Tuple[name, value]]`, optional): additional keyword arguments, specified by `register_unpack_format(*args, extra_args=None, **kwargs)`. Defaults to None.
      """
      raise NotImplementedError("implement your own unpack function")

    shutil.register_archive_format(
        "foobar", pack_foobar, description="foobar archives"
    )
    shutil.register_unpack_format("foobar", [".foo.bar"], unpack_foobar)


file = pathlibutil.Path("README.md")

print(f"available archive formats: {file.archive_formats}")

archive = file.make_archive("README.foo.bar")

backup = archive.move("./backup/")

print(f"archive created: {archive.name} and moved to: {backup.parent}")

Example 6

Access the current working directory with optional parameter frozen to determine different directories when script is bundled to an executable, e.g. with pyinstaller.

Path.cwd()

>>> poetry run examples/example6.py -b
Building frozen: K:/pathlibutil/examples/example6.exe
Build succeeded: 0

>>> poetry run examples/example6.py
we are                          not frozen

bundle dir is                   K:/pathlibutil/examples
sys.argv[0] is                  K:/pathlibutil/examples/example6.py
sys.executable is               K:/pathlibutil/.venv/Scripts/python.exe
os.getcwd is                    K:/pathlibutil

Path.cwd(frozen=True) is        K:/pathlibutil
Path.cwd(frozen=False) is       K:/pathlibutil
Path.cwd(frozen=_MEIPASS) is    K:/pathlibutil

>>> examples/example6.exe
we are                          ever so frozen

bundle dir is                   C:/Users/CHRIST~1.DOE/AppData/Local/Temp/_MEI106042
sys.argv[0] is                  examples/example6.exe
sys.executable is               K:/pathlibutil/examples/example6.exe
os.getcwd is                    K:/pathlibutil

Path.cwd(frozen=True) is        K:/pathlibutil/examples
Path.cwd(frozen=False) is       K:/pathlibutil
Path.cwd(frozen=_MEIPASS) is    C:/Users/CHRIST~1.DOE/AppData/Local/Temp/_MEI106042