Operation Preprocess

async dffml.operation.preprocess.literal_eval(str_to_eval: str)

Evaluate the input using ast.literal_eval()

Parameters:

str_to_eval (str) – A string to be evaluated.

Returns:

A dict containing python literal.

Return type:

dict

Examples

The following example shows how to use literal_eval.

>>> import asyncio
>>> from dffml import *
>>>
>>> dataflow = DataFlow.auto(literal_eval, GetSingle)
>>> dataflow.seed.append(
...    Input(
...        value=[literal_eval.op.outputs["str_after_eval"].name,],
...        definition=GetSingle.op.inputs["spec"],
...    )
... )
>>> inputs = [
...    Input(
...        value="[1,2,3]",
...        definition=literal_eval.op.inputs["str_to_eval"],
...        parents=None,
...    )
... ]
>>>
>>> async def main():
...     async for ctx, results in MemoryOrchestrator.run(dataflow, inputs):
...         print(results)
>>>
>>> asyncio.run(main())
{'EvaluatedStr': [1, 2, 3]}