read_block(f, offset, length, delimiter=None)

Parameters

f: file :

File-like object supporting seek, read, tell, etc..

offset: int :

Byte offset to start read

length: int :

Number of bytes to read

delimiter: bytes (optional) :

Ensure reading starts and stops at delimiter bytestring

If using the ``delimiter=`` keyword argument we ensure that the read :

starts and stops at delimiter boundaries that follow the locations :

``offset`` and ``offset + length``. If ``offset`` is zero then we :

start at zero. The bytestring returned WILL include the :

terminating delimiter string. :

Read a block of bytes from a file

Examples

This example is valid syntax, but we were not able to check execution

>>> from io import BytesIO  # doctest: +SKIP
... f = BytesIO(b'Alice, 100\nBob, 200\nCharlie, 300')  # doctest: +SKIP
... read_block(f, 0, 13)  # doctest: +SKIP
b'Alice, 100\nBo'

This example is valid syntax, but we were not able to check execution

>>> read_block(f, 0, 13, delimiter=b'\n')  # doctest: +SKIP
b'Alice, 100\nBob, 200\n'

This example is valid syntax, but we were not able to check execution

>>> read_block(f, 10, 10, delimiter=b'\n')  # doctest: +SKIP
b'Bob, 200\nCharlie, 300'

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

distributed.utils.read_block

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File: /distributed/utils.py#791
type: <class 'function'>
Commit: