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Render by default to stderr if stdout is redirected. #899

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Merged
merged 1 commit into from
Jun 4, 2019
Merged

Render by default to stderr if stdout is redirected. #899

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10 changes: 9 additions & 1 deletion prompt_toolkit/output/defaults.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,15 @@ def create_output(stdout: Optional[TextIO] = None) -> Output:

:param stdout: The stdout object
"""
stdout = stdout or sys.__stdout__
if stdout is None:
# By default, render to stdout. If the output is piped somewhere else,
# render to stderr. The prompt_toolkit render output is not meant to be
# consumed by something other then a terminal, so this is a reasonable
# default.
if sys.stdout.isatty():
stdout = sys.stdout
else:
stdout = sys.stderr

if is_windows():
from .conemu import ConEmuOutput
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