This follows a very common convention.  A single-letter parameter on the 
command line takes a single dash, longer parameters take a double dash. 
E.g., 

-h
--help

Some programs don't quite follow the convention (java, for example, 
understands java -version) but Python and Leo do.

On Monday, October 3, 2022 at 8:30:48 AM UTC-4 Thomas Passin wrote:

> I believe you need to type two dashes for the "editable" parameter:
>
> pip install --editable ....
>
>
> On Monday, October 3, 2022 at 7:23:41 AM UTC-4 [email protected] wrote:
>
>> I also tried to avoid cloud storage and whitespace issues by copying Leo 
>> to another folder, but it did not help either:
>> C:\Users\user>pip install -editable C:\Users\user\Apps\Leo\leo-editor-6.3
>>
>> ERROR: ditable is not a valid editable requirement. It should either be a 
>> path to a local project or a VCS URL (beginning with bzr+http, bzr+https, 
>> bzr+ssh, bzr+sftp, bzr+ftp, bzr+lp, bzr+file, git+http, git+https, git+ssh, 
>> git+git, git+file, hg+file, hg+http, hg+https, hg+ssh, hg+static-http, 
>> svn+ssh, svn+http, svn+https, svn+svn, svn+file).
>>
>> On Monday, October 3, 2022 at 1:11:03 PM UTC+2 User User wrote:
>>
>>> Update: trying to deal with whitespace in the path did not help:
>>> C:\Users\user>pip install -editable "C:\Users\user\OneDrive - 
>>> User\Apps\Leo\leo-editor-6.3"
>>> ERROR: ditable is not a valid editable requirement. It should either be 
>>> a path to a local project or a VCS URL (beginning with bzr+http, bzr+https, 
>>> bzr+ssh, bzr+sftp, bzr+ftp, bzr+lp, bzr+file, git+http, git+https, git+ssh, 
>>> git+git, git+file, hg+file, hg+http, hg+https, hg+ssh, hg+static-http, 
>>> svn+ssh, svn+http, svn+https, svn+svn, svn+file).
>>> On Monday, October 3, 2022 at 1:07:11 PM UTC+2 User User wrote:
>>>
>>>> Hi everyone,
>>>>
>>>> many thanks to Edward and the community for beautiful Leo. Need your 
>>>> help installing it on Windows.
>>>>
>>>> I usually work in Linux and install Leo successfully by downloading and 
>>>> unpacking leo-editor-6.3.zip and running launchLeo.py with gui=qt key. 
>>>> However, it did not work for me in Windows.
>>>>
>>>> I already have Python and Qt on my PC. This is what I tried:
>>>> C:\Users\user>python C:\Users\user\OneDrive - 
>>>> User\Apps\Leo\leo-editor-6.3\launchLeo.py --gui=qt
>>>> It fails: can't find '__main__' module in 'C:\\Users\\user\\OneDrive'
>>>>
>>>> When I try to run pip install according to Installing from sources 
>>>> recommendations I get:
>>>> C:\Users\user>pip install -editable C:\Users\user\OneDrive - 
>>>> User\Apps\Leo\leo-editor-6.3
>>>> ERROR: Directory 'C:\\Users\\user\\OneDrive' is not installable. 
>>>> Neither 'setup.py' nor 'pyproject.toml' found.
>>>>
>>>> "Installing Leo with pip" recommendation did not work for me either. 
>>>> Also, I prefer Leo 6.3.
>>>>
>>>> Appreciate any advice on how to install Leo (ideally, 6.3) on Windows!
>>>>
>>>> Kind regards, Serhii
>>>
>>>

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