StdoutWrapper

ClassPrivateContextSource

with syncstream.webtools.StdoutWrapper():
    ...

A wrapper for ensuring that the stdout is always directed to the same position.

danger

This class was designed from scratch. However, its functionality has been fully covered by contextlib.redirect_stdout(...) and contextlib.redirect_stdout(...). Therefore, users should not use this context in any case.

This document is only used for archiving what was done in this implementation.

Arguments

No argument is needed.

Example

Redirect stdout to buffer

Codes

use_stdout_context.py

import sys
import syncstream
from syncstream.webtools import StdoutWrapper

buffer = syncstream.LineBuffer(10)
with StdoutWrapper():
    sys.stdout = buffer
    for i in range(20):
        print(f'Message "{i:02d}".')
    print('No line break.', end='')

messages = buffer.read()
for mitem in messages:
    print(mitem)

Better codes

use_contextlib.py

from contextlib import redirect_stdout
import syncstream

buffer = syncstream.LineBuffer(10)
with redirect_stdout(buffer):
    for i in range(20):
        print(f'Message "{i:02d}".')
    print('No line break.', end='')

messages = buffer.read()
for mitem in messages:
    print(mitem)

Results

Message "11".
Message "12".
Message "13".
Message "14".
Message "15".
Message "16".
Message "17".
Message "18".
Message "19".
No line break.