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allow click to interoperate with jupyter notebooks #918

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allow click to interoperate with jupyter notebooks #918

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17 changes: 14 additions & 3 deletions click/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -211,11 +211,17 @@ def echo(message=None, file=None, nl=True, err=False, color=None):
:param color: controls if the terminal supports ANSI colors or not. The
default is autodetection.
"""
if file is None:
if is_running_jupyter():
if err:
file = _default_text_stderr()
file = sys.stderr
else:
file = _default_text_stdout()
file = sys.stdout
else:

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if file is None:
if err:
file = _default_text_stderr()
else:
file = _default_text_stdout()

# Convert non bytes/text into the native string type.
if message is not None and not isinstance(message, echo_native_types):
Expand Down Expand Up @@ -348,6 +354,11 @@ def get_os_args():
return sys.argv[1:]


def is_running_jupyter():
"""Return if running inside a Jupyter Notebook"""
return bool(os.getenv("JPY_PARENT_PID"))


def format_filename(filename, shorten=False):
"""Formats a filename for user display. The main purpose of this
function is to ensure that the filename can be displayed at all. This
Expand Down