dask_awkward.utils.ConcretizationTypeError

exception dask_awkward.utils.ConcretizationTypeError(msg)

This error occurs when a dask_awkward.Array is used in a context that requires a concrete value.

There are several reasons why this error might occur:

Examples

• When a dask_awkward.Array is used in a conditional statement:

>>> import dask_awkward as dak
>>> import awkward as ak
>>> dask_arr = dak.from_awkward(ak.Array([1]), npartitions=1)
>>> if dask_arr > 2:
>>>     dask_arr += 1
Traceback (most recent call last): ...
dask_awkward.utils.ConcretizationTypeError: A dask_awkward.Array is encountered in a computation where a concrete value is expected. If you intend to convert the dask_awkward.Array to a concrete value, use the `.compute()` method. The __bool__() method was called on dask.awkward<greater, npartitions=1>.

• When a dask_awkward.Array is cast to a Python type:

>>> import dask_awkward as dak
>>> import awkward as ak
>>> dask_arr = dak.from_awkward(ak.Array([1]), npartitions=1)
>>> int(dask_arr)
Traceback (most recent call last): ...
dask_awkward.utils.ConcretizationTypeError: A dask_awkward.Array is encountered in a computation where a concrete value is expected. If you intend to convert the dask_awkward.Array to a concrete value, use the `.compute()` method. The __int__() method was called on dask.awkward<from-awkward, npartitions=1>.

These errors can be resolved by explicitely converting the tracer to a concrete value:

>>> import dask_awkward as dak
>>> dask_arr = dak.from_awkward(ak.Array([1]), npartitions=1)
>>> bool(dask_arr.compute())
True

Parameters:

msg (str)