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.. jupyter-execute::
:hide-code:
import set_working_directory
.. _load_json:
Loading JSON serialised objects
-------------------------------
The ``load_json`` app loads JSON serialised ``cogent3`` objects from a file, returning whatever was stored.
In the :ref:`writing JSON section <write_json>`, we wrote a likelihood function object to disk in JSON serialised format, now let's load it back! All we need is the path to which it was written. Since ``write_json`` writes to a data store, this will be ``<path_to_dstore>/<identifier>``.
.. tip:: To follow along with this example, first head to the :ref:`writing JSON section <write_json>` to write out this data, or replace the path with a JSON file on your machine.
.. jupyter-execute::
:hide-code:
from cogent3 import get_app, open_data_store
from tempfile import TemporaryDirectory
tmpdir = TemporaryDirectory(dir=".")
path_to_dir = tmpdir.name
# create lf object to write
load_aligned_app = get_app("load_aligned", moltype="dna", format="fasta")
aln = load_aligned_app("data/primate_brca1.fasta")
gn_model_app = get_app("model", "GN", tree="data/primate_brca1.tree")
lf = gn_model_app(aln).lf
out_dstore = open_data_store(path_to_dir, mode="w", suffix="json")
# write with the same identifier as the write_json example
write_json_app = get_app("write_json", data_store=out_dstore)
data_member = write_json_app(lf, identifier="gn_params.json")
path_to_dstore = data_member.data_store.source
.. jupyter-execute::
:raises:
from cogent3 import get_app
load_json_app = get_app("load_json")
lf = load_json_app(f"{path_to_dstore}/gn_params.json")
lf
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