import re
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import pytest
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from pandas.core.indexes.frozen import FrozenList
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@pytest.fixture
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def lst():
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return [1, 2, 3, 4, 5]
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@pytest.fixture
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def container(lst):
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return FrozenList(lst)
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@pytest.fixture
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def unicode_container():
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return FrozenList(["\u05d0", "\u05d1", "c"])
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class TestFrozenList:
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def check_mutable_error(self, *args, **kwargs):
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# Pass whatever function you normally would to pytest.raises
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# (after the Exception kind).
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mutable_regex = re.compile("does not support mutable operations")
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msg = "'(_s)?re.(SRE_)?Pattern' object is not callable"
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with pytest.raises(TypeError, match=msg):
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mutable_regex(*args, **kwargs)
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def test_no_mutable_funcs(self, container):
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def setitem():
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container[0] = 5
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self.check_mutable_error(setitem)
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def setslice():
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container[1:2] = 3
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self.check_mutable_error(setslice)
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def delitem():
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del container[0]
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self.check_mutable_error(delitem)
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def delslice():
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del container[0:3]
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self.check_mutable_error(delslice)
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mutable_methods = ("extend", "pop", "remove", "insert")
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for meth in mutable_methods:
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self.check_mutable_error(getattr(container, meth))
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def test_slicing_maintains_type(self, container, lst):
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result = container[1:2]
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expected = lst[1:2]
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self.check_result(result, expected)
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def check_result(self, result, expected):
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assert isinstance(result, FrozenList)
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assert result == expected
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def test_string_methods_dont_fail(self, container):
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repr(container)
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str(container)
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bytes(container)
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def test_tricky_container(self, unicode_container):
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repr(unicode_container)
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str(unicode_container)
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def test_add(self, container, lst):
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result = container + (1, 2, 3)
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expected = FrozenList(lst + [1, 2, 3])
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self.check_result(result, expected)
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result = (1, 2, 3) + container
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expected = FrozenList([1, 2, 3] + lst)
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self.check_result(result, expected)
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def test_iadd(self, container, lst):
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q = r = container
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q += [5]
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self.check_result(q, lst + [5])
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# Other shouldn't be mutated.
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self.check_result(r, lst)
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def test_union(self, container, lst):
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result = container.union((1, 2, 3))
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expected = FrozenList(lst + [1, 2, 3])
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self.check_result(result, expected)
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def test_difference(self, container):
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result = container.difference([2])
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expected = FrozenList([1, 3, 4, 5])
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self.check_result(result, expected)
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def test_difference_dupe(self):
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result = FrozenList([1, 2, 3, 2]).difference([2])
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expected = FrozenList([1, 3])
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self.check_result(result, expected)
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def test_tricky_container_to_bytes_raises(self, unicode_container):
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# GH 26447
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msg = "^'str' object cannot be interpreted as an integer$"
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with pytest.raises(TypeError, match=msg):
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bytes(unicode_container)
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