Python Invoke - Can't find any collection named 'tasks'!

Question

I did the getting started on Python Invoke

from invoke import task

@task
def build():
    print("Building!")

The expected output is

$ invoke build
Building!

However, my output is

$ invoke build
Can't find any collection named 'tasks'!

I have no idea why.

Something amazing is, once I invoke in the virtualenv, then I can build without virtualenv.

> mkvirtualenv myenv
> invoke build
Building!
> deactivate myenv
> invoke build
Building!

Did I miss something?

score 19 · Accepted Answer · answered Aug 18 '15 at 16:55

19

According to documentation your file containing task should be named tasks.py. Make sure you are running build from the same directory as tasks.py, too

answered Aug 18 '15 at 16:55

hspandher

15,934
2
32
45

1

Thanks, I got it! I misnamed it task.py :P – Asoul Aug 18 '15 at 17:16
I came here because this file: "https://www.pyinvoke.org/faq.html#invoke-split-from-fabric" should probably say that "fabfile.py" is not "tasks.py". – Danny Staple Sep 26 '18 at 13:44
is it possible to run invoke from different directory – Pardhu Feb 25 '20 at 09:05
Yes, you can point `--search-root` to your directory to pick up tasks from there. – sreenivas Dec 10 '21 at 11:02

score 6 · Answer 2 · answered Jul 14 '20 at 05:39

You can also rename tasks.py to the name of your choice and can run it with '-c' option.

Suppose below is your simple py file named as 'invoke_testing.py'

from invoke import task

@task
def check_config_files(c):
    print("Hey I am Checking configurations")

You need to run through command line like this: for example to list down the availabe tasks

invoke -c invoke_testing --lists

which outputs:

Available tasks:
  check-config-files

p.s. '_' has been replace with '-' in the function name and if you need to run a specific task, it has be run with name as listed in the list.

invoke -c invoke_testing check-config-files

I got this reference from this source Python Invoke

Let me know if anyone gets more information around this.

Python Invoke - Can't find any collection named 'tasks'!

2 Answers2