pathlib.Path subclasses for local and cloud bucket storage
Project description
Pathy: a Path interface for local and cloud bucket storage
Pathy is a python package (with type annotations) for working with Bucket storage providers. It provides a CLI app for basic file operations between local files and remote buckets. It enables a smooth developer experience by supporting local file-system backed buckets during development and testing. It makes converting bucket blobs into local files a snap with optional local file caching of blobs.
🚀 Quickstart
You can install pathy
from pip:
pip install pathy
The package exports the Pathy
class and utilities for configuring the bucket storage provider to use. By default Pathy prefers GoogleCloudStorage paths of the form gs://bucket_name/folder/blob_name.txt
. Internally Pathy can convert GCS paths to local files, allowing for a nice developer experience.
from pathy import Pathy
# Any bucket you have access to will work
greeting = Pathy(f"gs://my_bucket/greeting.txt")
# The blob doesn't exist yet
assert not greeting.exists()
# Create it by writing some text
greeting.write_text("Hello World!")
# Now it exists
assert greeting.exists()
# Delete it
greeting.unlink()
# Now it doesn't
assert not greeting.exists()
Semantic Versioning
Before Pathy reaches v1.0 the project is not guaranteed to have a consistent API, which means that types and classes may move around or be removed. That said, we try to be predictable when it comes to breaking changes, so the project uses semantic versioning to help users avoid breakage.
Specifically, new releases increase the patch
semver component for new features and fixes, and the minor
component when there are breaking changes. If you don't know much about semver strings, they're usually formatted {major}.{minor}.{patch}
so increasing the patch
component means incrementing the last number.
Consider a few examples:
From Version | To Version | Changes are Breaking |
---|---|---|
0.2.0 | 0.2.1 | No |
0.3.2 | 0.3.6 | No |
0.3.1 | 0.3.17 | No |
0.2.2 | 0.3.0 | Yes |
If you are concerned about breaking changes, you can pin the version in your requirements so that it does not go beyond the current semver minor
component, for example if the current version was 0.1.37
:
pathy>=0.1.37,<0.2.0
🎛 API
Pathy class
Pathy(self, args, kwargs)
Subclass of pathlib.Path
that works with bucket APIs.
exists method
Pathy.exists(self) -> bool
Returns True if the path points to an existing bucket, blob, or prefix.
fluid classmethod
Pathy.fluid(
path_candidate: Union[str, Pathy, pathlib.Path],
) -> Union[Pathy, pathlib.Path]
Infer either a Pathy or pathlib.Path from an input path or string.
The returned type is a union of the potential FluidPath
types and will
type-check correctly against the minimum overlapping APIs of all the input
types.
If you need to use specific implementation details of a type, "narrow" the return of this function to the desired type, e.g.
fluid_path = FluidPath("gs://my_bucket/foo.txt")
# Narrow the type to a specific class
assert isinstance(fluid_path, Pathy), "must be Pathy"
# Use a member specific to that class
print(fluid_path.prefix)
from_bucket classmethod
Pathy.from_bucket(bucket_name: str) -> 'Pathy'
Initialize a Pathy from a bucket name. This helper adds a trailing slash and the appropriate prefix.
assert str(Pathy.from_bucket("one")) == "gs://one/"
assert str(Pathy.from_bucket("two")) == "gs://two/"
glob method
Pathy.glob(
self: 'Pathy',
pattern: str,
) -> Generator[Pathy, NoneType, NoneType]
Perform a glob match relative to this Pathy instance, yielding all matched blobs.
is_dir method
Pathy.is_dir(self: 'Pathy') -> bool
Determine if the path points to a bucket or a prefix of a given blob in the bucket.
Returns True if the path points to a bucket or a blob prefix. Returns False if it points to a blob or the path doesn't exist.
is_file method
Pathy.is_file(self: 'Pathy') -> bool
Determine if the path points to a blob in the bucket.
Returns True if the path points to a blob. Returns False if it points to a bucket or blob prefix, or if the path doesn’t exist.
iterdir method
Pathy.iterdir(
self: 'Pathy',
) -> Generator[Pathy, NoneType, NoneType]
Iterate over the blobs found in the given bucket or blob prefix path.
mkdir method
Pathy.mkdir(
self,
mode: int = 511,
parents: bool = False,
exist_ok: bool = False,
) -> None
Create a bucket from the given path. Since bucket APIs only have implicit folder structures (determined by the existence of a blob with an overlapping prefix) this does nothing other than create buckets.
If parents is False, the bucket will only be created if the path points to exactly the bucket and nothing else. If parents is true the bucket will be created even if the path points to a specific blob.
The mode param is ignored.
Raises FileExistsError if exist_ok is false and the bucket already exists.
open method
Pathy.open(
self: 'Pathy',
mode: str = 'r',
buffering: int = 8192,
encoding: Optional[str] = None,
errors: Optional[str] = None,
newline: Optional[str] = None,
) -> IO[Any]
Open the given blob for streaming. This delegates to the smart_open
library that handles large file streaming for a number of bucket API
providers.
owner method
Pathy.owner(self: 'Pathy') -> Optional[str]
Returns the name of the user that owns the bucket or blob this path points to. Returns None if the owner is unknown or not supported by the bucket API provider.
rename method
Pathy.rename(self: 'Pathy', target: Union[str, pathlib.PurePath]) -> None
Rename this path to the given target.
If the target exists and is a file, it will be replaced silently if the user has permission.
If path is a blob prefix, it will replace all the blobs with the same prefix to match the target prefix.
replace method
Pathy.replace(self: 'Pathy', target: Union[str, pathlib.PurePath]) -> None
Renames this path to the given target.
If target points to an existing path, it will be replaced.
resolve method
Pathy.resolve(self, strict: bool = False) -> 'Pathy'
Resolve the given path to remove any relative path specifiers.
path = Pathy("gs://my_bucket/folder/../blob")
assert path.resolve() == Pathy("gs://my_bucket/blob")
rglob method
Pathy.rglob(
self: 'Pathy',
pattern: str,
) -> Generator[Pathy, NoneType, NoneType]
Perform a recursive glob match relative to this Pathy instance, yielding all matched blobs. Imagine adding "**/" before a call to glob.
rmdir method
Pathy.rmdir(self: 'Pathy') -> None
Removes this bucket or blob prefix. It must be empty.
samefile method
Pathy.samefile(
self: 'Pathy',
other_path: Union[str, bytes, int, pathlib.Path],
) -> bool
Determine if this path points to the same location as other_path.
stat method
Pathy.stat(self: 'Pathy') -> pathy.base.BlobStat
Returns information about this bucket path.
to_local classmethod
Pathy.to_local(
blob_path: Union[Pathy, str],
recurse: bool = True,
) -> pathlib.Path
Download and cache either a blob or a set of blobs matching a prefix.
The cache is sensitive to the file updated time, and downloads new blobs as their updated timestamps change.
touch method
Pathy.touch(self: 'Pathy', mode: int = 438, exist_ok: bool = True) -> None
Create a blob at this path.
If the blob already exists, the function succeeds if exist_ok is true (and its modification time is updated to the current time), otherwise FileExistsError is raised.
BlobStat dataclass
BlobStat(
self,
size: Optional[int],
last_modified: Optional[int],
) -> None
Stat for a bucket item
use_fs function
use_fs(
root: Optional[str, pathlib.Path, bool] = None,
) -> Optional[pathy.file.BucketClientFS]
Use a path in the local file-system to store blobs and buckets.
This is useful for development and testing situations, and for embedded applications.
get_fs_client function
get_fs_client() -> Optional[pathy.file.BucketClientFS]
Get the file-system client (or None)
use_fs_cache function
use_fs_cache(
root: Optional[str, pathlib.Path, bool] = None,
) -> Optional[pathlib.Path]
Use a path in the local file-system to cache blobs and buckets.
This is useful for when you want to avoid fetching large blobs multiple times, or need to pass a local file path to a third-party library.
get_fs_cache function
get_fs_cache() -> Optional[pathlib.Path]
Get the folder that holds file-system cached blobs and timestamps.
CLI
Pathy command line interface.
Usage:
$ [OPTIONS] COMMAND [ARGS]...
Options:
--install-completion
: Install completion for the current shell.--show-completion
: Show completion for the current shell, to copy it or customize the installation.--help
: Show this message and exit.
Commands:
cp
: Copy a blob or folder of blobs from one...ls
: List the blobs that exist at a given...mv
: Move a blob or folder of blobs from one path...rm
: Remove a blob or folder of blobs from a given...
cp
Copy a blob or folder of blobs from one bucket to another.
Usage:
$ cp [OPTIONS] FROM_LOCATION TO_LOCATION
Options:
FROM_LOCATION
: [required]TO_LOCATION
: [required]--help
: Show this message and exit.
ls
List the blobs that exist at a given location.
Usage:
$ ls [OPTIONS] LOCATION
Options:
LOCATION
: [required]--help
: Show this message and exit.
mv
Move a blob or folder of blobs from one path to another.
Usage:
$ mv [OPTIONS] FROM_LOCATION TO_LOCATION
Options:
FROM_LOCATION
: [required]TO_LOCATION
: [required]--help
: Show this message and exit.
rm
Remove a blob or folder of blobs from a given location.
Usage:
$ rm [OPTIONS] LOCATION
Options:
LOCATION
: [required]-r, --recursive
: Recursively remove files and folders. [default: False]-v, --verbose
: Print removed files and folders. [default: False]--help
: Show this message and exit.
Credits
Pathy is originally based on the S3Path project, which provides a Path interface for S3 buckets.
Project details
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