代码之家 › 专栏 › 技术社区 › The Unfun Cat

如何在假设中使用复合策略(hypothesis.errors.invalidargument:expected searchstrategy but got function)

python-hypothesis

1

The Unfun Cat · 技术社区 · 6 年前

这个例子是 docs :

import hypothesis.strategies as st

from hypothesis import given

@st.composite
def s(draw):
    x = draw(st.text(), min_size=1)
    y = draw(st.text(alphabet=x))
    return (x, y)



@given(s1=s, s2=s)
def test_subtraction(s1, s2):

    print(s1, s2)

    assert 0

失败了:

E hypothesis.errors.InvalidArgument: Expected SearchStrategy but got <function accept.<locals>.s at 0x7fd7e5c05620> (type=function)

/mnt/work/unfuncat/software/anaconda/lib/python3.6/site-packages/hypothesis/internal/validation.py:40: InvalidArgument

我做错什么了?

1 回复 | 直到 6 年前

1

0

The Unfun Cat 6 年前

您需要调用复合函数。这在文档中没有解释,但是在 2016 blog post .

@given(s1=s(), s2=s()) # <===== change
def test_subtraction(s1, s2):

    print(s1, s2)

    assert 0