Documented way for starting Luigi tasks inside Python code

[nryanov]

Description

Information about another existing way for starting Luigi tasks

Motivation and Context

This way can be useful if user wants to get dynamic params from anywhere before start the task and pass them automatically

[Tarrasch]

Looks good:

• Can you change the filename from "comman_line" to "running_luigi" or something?
• Perhaps remove the class file code?
• If you mention run() you should also mention build I think to be fair, and also link to the whole run interface code module.

[erikbern]

I don't think this is the right way to run tasks from inside Python. Why deal with the command line interface at all

[erikbern]

Look at interface.build: https://github.com/spotify/luigi/blob/master/luigi/interface.py#L251

We should probably document that somewhere

[Tarrasch]

Actually yes, looking at the code it seems it heeds quite strong warnings against using run (written by myself a long time ago).

[nryanov]

Oh, yes, i had to document build, not run (as i see now). It's all because i use run method in my code despite on warnings about it ^_^

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So, i'll edit it after i try out build in my code

[dlstadther]

Any update here @Gr1f0n6x ?

[nryanov]

@dlstadther yes, sorry for delay (a lot of work), i'll continue to work on this issue and try to finish another one (parameter visibility)

[nryanov]

My apologize for big delay in time.

i amended the doc as you proposed and additionally i added minor extra information which may be useful for users who want to provide additional logic in task execution or something else

[Tarrasch]

Wow, what an improvement! Thanks!