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توضیحات

Asynchronous CSV reading/writing

ویژگی	مقدار
سیستم عامل	-
نام فایل	aiocsv-1.2.3
نام	aiocsv
نسخه کتابخانه	1.2.3
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Mikołaj Kuranowski
ایمیل نویسنده	mkuranowski@gmail.com
آدرس صفحه اصلی	https://github.com/MKuranowski/aiocsv
آدرس اینترنتی	https://pypi.org/project/aiocsv/
مجوز	MIT

# aiocsv Asynchronous CSV reading and writing. ## Installation Python 3.6+ is required. `pip3 install aiocsv` ## Usage AsyncReader & AsyncDictReader accept any object that has a `read(size: int)` coroutine, which should return a string. AsyncWriter & AsyncDictWriter accept any object that has a `write(b: str)` coroutine. Reading is implemented using a custom CSV parser, which should behave exactly like the CPython parser. Writing is implemented using the synchronous csv.writer and csv.DictWriter objects - the serializers write data to a StringIO, and that buffer is then rewritten to the underlaying asynchronous file. ## Example Example usage with [aiofiles](https://pypi.org/project/aiofiles/). ```python import asyncio import csv import aiofiles from aiocsv import AsyncReader, AsyncDictReader, AsyncWriter, AsyncDictWriter async def main(): # simple reading async with aiofiles.open("some_file.csv", mode="r", encoding="utf-8", newline="") as afp: async for row in AsyncReader(afp): print(row) # row is a list # dict reading, tab-separated async with aiofiles.open("some_other_file.tsv", mode="r", encoding="utf-8", newline="") as afp: async for row in AsyncDictReader(afp, delimiter="\t"): print(row) # row is a dict # simple writing, "unix"-dialect async with aiofiles.open("new_file.csv", mode="w", encoding="utf-8", newline="") as afp: writer = AsyncWriter(afp, dialect="unix") await writer.writerow(["name", "age"]) await writer.writerows([ ["John", 26], ["Sasha", 42], ["Hana", 37] ]) # dict writing, all quoted, "NULL" for missing fields async with aiofiles.open("new_file2.csv", mode="w", encoding="utf-8", newline="") as afp: writer = AsyncDictWriter(afp, ["name", "age"], restval="NULL", quoting=csv.QUOTE_ALL) await writer.writeheader() await writer.writerow({"name": "John", "age": 26}) await writer.writerows([ {"name": "Sasha", "age": 42}, {"name": "Hana"} ]) asyncio.run(main()) ``` ## Reference ### aiocsv.AsyncReader `AsyncReader(asyncfile: aiocsv.protocols.WithAsyncRead, **csvreaderparams)` An object that iterates over lines in given asynchronous file. Additional keyword arguments are understood as dialect parameters. Iterating over this object returns parsed CSV rows (`List[str]`). *Methods*: - `__aiter__(self) -> self` - `async __anext__(self) -> List[str]` *Properties*: - `dialect`: The csv.Dialect used when parsing *Read-only properties*: - `line_num`: Not implemented in aiocsv - issues a warning and always returns -1. ### aiocsv.AsyncDictReader ``` AsyncDictReader(asyncfile: aiocsv.protocols.WithAsyncRead, fieldnames: Optional[Sequence[str]] = None, restkey: Optional[str] = None, restval: Optional[str] = None, **csvreaderparams) ``` An object that iterates over lines in given asynchronous file. All arguments work exactly the same like in csv.DictReader. Iterating over this object returns parsed CSV rows (`Dict[str, str]`). *Methods*: - `__aiter__(self) -> self` - `async __anext__(self) -> Dict[str, str]` *Properties*: - `fieldnames`: field names used when converting rows to dictionaries **⚠️** Unlike csv.DictReader, if not provided in the constructor, at least one row has to be retrieved before getting the fieldnames. ```py reader = csv.DictReader(some_file) reader.fieldnames # ["cells", "from", "the", "header"] areader = aiofiles.AsyncDictReader(same_file_but_async) areader.fieldnames # ⚠️ None await areader.__anext__() areader.fieldnames # ["cells", "from", "the", "header"] ``` - `restkey`: If a row has more cells then the header, all remaining cells are stored under this key in the returned dictionary. Defaults to `None`. - `restval`: If a row has less cells then the header, then missing keys will use this value. Defaults to `None`. - `reader`: Underlaying `aiofiles.AsyncReader` instance *Read-only properties*: - `dialect`: Link to `self.reader.dialect` - the current csv.Dialect - `line_num`: Not implemented in aiocsv - issues a warning and always returns -1 ### aiocsv.AsyncWriter `AsyncWriter(asyncfile: aiocsv.protocols.WithAsyncWrite, **csvwriterparams)` An object that writes csv rows to the given asynchronous file. In this object "row" is a sequence of values. Additional keyword arguments are passed to the underlying csv.writer instance. *Methods*: - `async writerow(self, row: Iterable[Any]) -> None` Writes one row to the specified file. - `async writerows(self, rows: Iterable[Iterable[Any]]) -> None` Writes multiple rows to the specified file. All rows are temporarly stored in RAM before actually being written to the file, so don't provide a generator of loads of rows. *Readonly properties*: - `dialect`: Link to underlying's csv.reader's `dialect` attribute ### aiocsv.AsyncDictWriter `AsyncDictWriter(asyncfile: aiocsv.protocols.WithAsyncWrite, fieldnames: Sequence[str], **csvdictwriterparams)` An object that writes csv rows to the given asynchronous file. In this object "row" is a mapping from fieldnames to values. Additional keyword arguments are passed to the underlying csv.DictWriter instance. *Methods*: - `async writeheader(self) -> None` Writes header row to the specified file. - `async writerow(self, row: Mapping[str, Any]) -> None` Writes one row to the specified file. - `async writerows(self, rows: Iterable[Mapping[str, Any]]) -> None` Writes multiple rows to the specified file. All rows are temporarly stored in RAM before actually being written to the file, so don't provide a generator of loads of rows. *Readonly properties*: - `dialect`: Link to underlying's csv.reader's `dialect` attribute ### aiocsv.protocols.WithAsyncRead A `typing.Protocol` describing an asynchronous file, which can be read. ### aiocsv.protocols.WithAsyncWrite A `typing.Protocol` describing an asynchronous file, which can be written to.

زبان مورد نیاز

مقدار	نام
>=3.6, <4	Python

نحوه نصب

نصب پکیج whl aiocsv-1.2.3:

pip install aiocsv-1.2.3.whl

نصب پکیج tar.gz aiocsv-1.2.3:

pip install aiocsv-1.2.3.tar.gz