Handle PyYAML ValueError with "._" input

[The-Compiler]

https://ci.appveyor.com/project/qutebrowser/qutebrowser/builds/23321781/job/rn2uhv74nqup2y7x

__________________ TestAll.test_from_str_hypothesis[klass19] __________________
self = <test_configtypes.TestAll object at 0x000000FAF83F0E80>
klass = functools.partial(<class 'qutebrowser.config.configtypes.List'>, valtype=<qutebrowser.config.configtypes.Url object at 0x000000FADA7F5438>)
    @pytest.mark.usefixtures('config_tmpdir')
>   @hypothesis.given(strategies.text())
    @hypothesis.example('\x00')
    def test_from_str_hypothesis(self, klass, s):
tests\unit\config\test_configtypes.py:219: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests\unit\config\test_configtypes.py:224: in test_from_str_hypothesis
    val = typ.from_str(s)
qutebrowser\config\configtypes.py:476: in from_str
    yaml_val = utils.yaml_load(value)
qutebrowser\utils\utils.py:669: in yaml_load
    data = yaml.load(f, Loader=YamlLoader)
.tox\py37-pyqt512\lib\site-packages\yaml\__init__.py:114: in load
    return loader.get_single_data()
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:43: in get_single_data
    return self.construct_document(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:47: in construct_document
    data = self.construct_object(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:92: in construct_object
    data = constructor(self, node)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <yaml.cyaml.CSafeLoader object at 0x000000FAF357C688>
node = ScalarNode(tag='tag:yaml.org,2002:float', value='._')
    def construct_yaml_float(self, node):
        value = self.construct_scalar(node)
        value = value.replace('_', '').lower()
        sign = +1
        if value[0] == '-':
            sign = -1
        if value[0] in '+-':
            value = value[1:]
        if value == '.inf':
            return sign*self.inf_value
        elif value == '.nan':
            return self.nan_value
        elif ':' in value:
            digits = [float(part) for part in value.split(':')]
            digits.reverse()
            base = 1
            value = 0.0
            for digit in digits:
                value += digit*base
                base *= 60
            return sign*value
        else:
>           return sign*float(value)
E           ValueError: could not convert string to float: '.'
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:284: ValueError
----------------------------- Captured log setup ------------------------------
config.py                  323 DEBUG    Config option changed: aliases = {}
--------------------------------- Hypothesis ----------------------------------
Falsifying example: test_from_str_hypothesis(self=<test_configtypes.TestAll at 0xfaf83f0e80>, klass=functools.partial(<class 'qutebrowser.config.configtypes.List'>, valtype=<qutebrowser.config.configtypes.Url object at 0x000000FADA7F5438>), s='._')
You can reproduce this example by temporarily adding @reproduce_failure('4.12.0', b'AAEAAgEBAAAvAA==') as a decorator on your test case

__________________ TestAll.test_from_str_hypothesis[klass20] __________________
self = <test_configtypes.TestAll object at 0x000000FAF842DB00>
klass = functools.partial(<class 'qutebrowser.config.configtypes.ListOrValue'>, valtype=<qutebrowser.config.configtypes.Int object at 0x000000FADA7F5400>)
    @pytest.mark.usefixtures('config_tmpdir')
>   @hypothesis.given(strategies.text())
    @hypothesis.example('\x00')
    def test_from_str_hypothesis(self, klass, s):
tests\unit\config\test_configtypes.py:219: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests\unit\config\test_configtypes.py:224: in test_from_str_hypothesis
    val = typ.from_str(s)
qutebrowser\config\configtypes.py:569: in from_str
    return self.listtype.from_str(value)
qutebrowser\config\configtypes.py:476: in from_str
    yaml_val = utils.yaml_load(value)
qutebrowser\utils\utils.py:669: in yaml_load
    data = yaml.load(f, Loader=YamlLoader)
.tox\py37-pyqt512\lib\site-packages\yaml\__init__.py:114: in load
    return loader.get_single_data()
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:43: in get_single_data
    return self.construct_document(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:47: in construct_document
    data = self.construct_object(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:92: in construct_object
    data = constructor(self, node)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <yaml.cyaml.CSafeLoader object at 0x000000FAF3579988>
node = ScalarNode(tag='tag:yaml.org,2002:float', value='._')
    def construct_yaml_float(self, node):
        value = self.construct_scalar(node)
        value = value.replace('_', '').lower()
        sign = +1
        if value[0] == '-':
            sign = -1
        if value[0] in '+-':
            value = value[1:]
        if value == '.inf':
            return sign*self.inf_value
        elif value == '.nan':
            return self.nan_value
        elif ':' in value:
            digits = [float(part) for part in value.split(':')]
            digits.reverse()
            base = 1
            value = 0.0
            for digit in digits:
                value += digit*base
                base *= 60
            return sign*value
        else:
>           return sign*float(value)
E           ValueError: could not convert string to float: '.'
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:284: ValueError
----------------------------- Captured log setup ------------------------------
config.py                  323 DEBUG    Config option changed: aliases = {}
--------------------------------- Hypothesis ----------------------------------
Falsifying example: test_from_str_hypothesis(self=<test_configtypes.TestAll at 0xfaf842db00>, klass=functools.partial(<class 'qutebrowser.config.configtypes.ListOrValue'>, valtype=<qutebrowser.config.configtypes.Int object at 0x000000FADA7F5400>), s='._')
You can reproduce this example by temporarily adding @reproduce_failure('4.12.0', b'AAEAAgEBAAAvAA==') as a decorator on your test case

__________________ TestAll.test_from_str_hypothesis[klass21] __________________
self = <test_configtypes.TestAll object at 0x000000FAF8C360B8>
klass = functools.partial(<class 'qutebrowser.config.configtypes.ListOrValue'>, valtype=<qutebrowser.config.configtypes.Url object at 0x000000FADA7F5390>)
    @pytest.mark.usefixtures('config_tmpdir')
>   @hypothesis.given(strategies.text())
    @hypothesis.example('\x00')
    def test_from_str_hypothesis(self, klass, s):
tests\unit\config\test_configtypes.py:219: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests\unit\config\test_configtypes.py:224: in test_from_str_hypothesis
    val = typ.from_str(s)
qutebrowser\config\configtypes.py:569: in from_str
    return self.listtype.from_str(value)
qutebrowser\config\configtypes.py:476: in from_str
    yaml_val = utils.yaml_load(value)
qutebrowser\utils\utils.py:669: in yaml_load
    data = yaml.load(f, Loader=YamlLoader)
.tox\py37-pyqt512\lib\site-packages\yaml\__init__.py:114: in load
    return loader.get_single_data()
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:43: in get_single_data
    return self.construct_document(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:47: in construct_document
    data = self.construct_object(node)
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:92: in construct_object
    data = constructor(self, node)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <yaml.cyaml.CSafeLoader object at 0x000000FAF357F928>
node = ScalarNode(tag='tag:yaml.org,2002:float', value='._')
    def construct_yaml_float(self, node):
        value = self.construct_scalar(node)
        value = value.replace('_', '').lower()
        sign = +1
        if value[0] == '-':
            sign = -1
        if value[0] in '+-':
            value = value[1:]
        if value == '.inf':
            return sign*self.inf_value
        elif value == '.nan':
            return self.nan_value
        elif ':' in value:
            digits = [float(part) for part in value.split(':')]
            digits.reverse()
            base = 1
            value = 0.0
            for digit in digits:
                value += digit*base
                base *= 60
            return sign*value
        else:
>           return sign*float(value)
E           ValueError: could not convert string to float: '.'
.tox\py37-pyqt512\lib\site-packages\yaml\constructor.py:284: ValueError
----------------------------- Captured log setup ------------------------------
config.py                  323 DEBUG    Config option changed: aliases = {}
--------------------------------- Hypothesis ----------------------------------
Falsifying example: test_from_str_hypothesis(self=<test_configtypes.TestAll at 0xfaf8c360b8>, klass=functools.partial(<class 'qutebrowser.config.configtypes.ListOrValue'>, valtype=<qutebrowser.config.configtypes.Url object at 0x000000FADA7F5390>), s='._')
You can reproduce this example by temporarily adding @reproduce_failure('4.12.0', b'AAEAAgEBAAAvAA==') as a decorator on your test case

See yaml/pyyaml#168