Forcing numpy arrays generated by Python hypothesis to contain all allowed elements - Stack Overflow

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I generate test data using Python's hypothesis library.

For example, I am generating a numpy array that may contain 0 and 1 like this:

arr = hypothesis.extra.numpy.arrays(dtype=np.int8, shape=10, elements=st.integers(0, 1))

How can I make sure, that the generated arr always contains all allowed elements? That is, arr needs to contain at least one 0 and one 1.

I also need to ensure that I return an np.array of dtype=np.int8 with a specific shape.

I generate test data using Python's hypothesis library.

For example, I am generating a numpy array that may contain 0 and 1 like this:

arr = hypothesis.extra.numpy.arrays(dtype=np.int8, shape=10, elements=st.integers(0, 1))

How can I make sure, that the generated arr always contains all allowed elements? That is, arr needs to contain at least one 0 and one 1.

I also need to ensure that I return an np.array of dtype=np.int8 with a specific shape.

• python
• python-hypothesis

Share Improve this question Follow edited Nov 20, 2024 at 10:15 Andi asked Nov 20, 2024 at 7:59 AndiAndi 4,89955 gold badges3333 silver badges6363 bronze badges 2

• This question is similar to: How can I generate a hypothesis strategy to generate a list that contains at least one of each element it samples from?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. – Kraigolas Commented Nov 20, 2024 at 8:08
• This question points in the right direction, however, I need a numpy array where I can specify the dtype and the exact shape. – Andi Commented Nov 20, 2024 at 8:24

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1 Answer 1

Sorted by: Reset to default 0

In this case, I think that filtering is probably the best way forward: generate any array, and throw away the small fraction that don't meet your requirements.

arrays(
    dtype=np.int8, 
    shape=10,  # or `(2, 3)`, or whatever shape you desire
    elements=st.integers(0, 1)
).filter(
    lambda arr: {0, 1}.issubset(arr.flatten())
)

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