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linesep provides basic functions & classes for reading, writing, splitting, & joining text with custom separators that can occur either before, between, or after the segments they separate.

Installation

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

python3 -m pip install linesep

Examples

Reading sections separated by a "---" line:

with open('text.txt') as fp:
    for entry in linesep.read_separated(fp, '\n---\n'):
        ...

Parsing output from find -print0:

find = subprocess.Popen(
    ['find', '/', '-some', '-complicated', '-condition', '-print0'],
    stdout=subprocess.PIPE,
)
for filepath in linesep.read_terminated(find.stdout, '\0'):
    ...

A poor man's JSON Text Sequence parser:

for entry in linesep.read_preceded(fp, '\x1E'):
    try:
        obj = json.loads(entry)
    except ValueError:
        pass
    else:
        yield obj

Read from a text file one paragraph at a time:

with open("my-novel.txt") as fp:
    for paragraph in linesep.read_paragraphs(fp):
        ...

Split input from an anyio.TextReceiveStream on newlines:

async with anyio.TextReceiveStream( ... ) as stream:
    splitter = linesep.UnicodeNewlineSplitter()
    async for line in splitter.aitersplit(stream):
        print(line)