Provide a simple way to delete and edit python's welcome message

[benp]

BPO	36255
Nosy	@rhettinger, @stevendaprano, @tirkarthi, @iritkatriel

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/rhettinger'
closed_at = <Date 2020-10-01.01:52:53.566>
created_at = <Date 2019-03-10.14:17:29.692>
labels = ['interpreter-core', 'invalid', 'type-feature', '3.7']
title = "Provide a simple way to delete and edit python's welcome message"
updated_at = <Date 2020-10-01.01:52:53.565>
user = 'https://bugs.python.org/benp'

bugs.python.org fields:

activity = <Date 2020-10-01.01:52:53.565>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2020-10-01.01:52:53.566>
closer = 'rhettinger'
components = ['Interpreter Core']
creation = <Date 2019-03-10.14:17:29.692>
creator = 'benp'
dependencies = []
files = []
hgrepos = []
issue_num = 36255
keywords = []
message_count = 8.0
messages = ['337614', '337615', '337616', '337617', '337618', '377544', '377549', '377723']
nosy_count = 6.0
nosy_names = ['rhettinger', 'steven.daprano', 'SilentGhost', 'xtreak', 'benp', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36255'
versions = ['Python 3.7']

[benp]

To my knowledge and extensive research on the problem, there is no simple way to disable python's welcome message:

"""
Python 3.7.2 (default, Jan 13 2019, 12:50:01)
[Clang 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
"""

It is appended to stdout before the execution of PYTHONSTARTUP and is very difficult to remove. This could be easily fixed by:

1. Allowing modification of the welcome message in PYTHONSTARTUP
2. Provide an option to disable it (IPython provides a --no-banner option to disable it)
3. At least provide a documented way of disabling it without hijacking the shell.

[tirkarthi]

Does python -q help in this case?

$ python -q

>>

[benp]

Yes, I forgot about that, but is there a way to edit it ?
I just want to add a line after the first one to give system information.
Disabling it and re-printing it seams a bit overkill and I don't want to alias python to python -q.

[stevendaprano]

Why do you want to disable the welcome message?

I just want to add a line after the first one to give system information.

Sounds like you just want to print something extra, after the welcome message has been printed.

[SilentGhost]

You could define PYTHONSTARTUP variable and modify everything to your heart's content. https://docs.python.org/3/using/cmdline.html#envvar-PYTHONSTARTUP

[iritkatriel]

I think this issue can be closed, there is nothing to do on it.

[rhettinger]

I think this issue can be closed, there is nothing to do on it.

Right.

[iritkatriel]

Raymond, I think you intended to close this but missed a click.