Using an Iterable

You can pass a slice of an iterable returned by one electron as an input to another iterable in a lattice.

Prerequisites

Create two electrons, one that returns an iterable and one that takes an iterable as an input.

import covalent as ct

@ct.electron
def task_1():
    return ['a', 'b', 'c', 'd', 'e']

@ct.electron
def task_2(items):
    items.reverse()
    return(items)

Procedure

Pass the first electron’s iterable output to the second electron.

@ct.lattice
def workflow(**params):
    res_1 = task_1()
    res_2 = task_2(res_1) # Using an iterable data structure as an input parameter
    return(res_2)

You don’t have to pass the entire iterable. You can pass an arbitrary slice of it instead:

@ct.lattice
def workflow(**params):
    res_1 = task_1()
    res_2 = task_2(res_1[1:3]) # Using an iterable data structure slice as an input parameter
    return(res_2)

The key idea is that no work is done on the data outside of the electrons.

See Also

Adding Electrons to Lattices

Looping