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Title:
`pytest.approx` fails with `TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'` Β· Issue #10702 Β· pytest-dev/pytest
Description:
When using approx to test float and one of the objects in the assert statement contain None I see the following TypeError: TypeError: unsupported operand type(s) for -: 'float' and 'Non...
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Keywords {π}
pytest, typeerror, float, approx, unsupported, operand, types, nonetype, error, sign, pytestapprox, issue, dict, function, projects, assert, commented, kennyydev, approxmapping, navigation, open, pull, requests, actions, security, fails, closed, test, assertion, actualresult, approxexpectedresult, pip, ronnypfannschmidt, member, approxable, zachd, added, topic, related, adjusted, handle, values, nicoddemus, handling, fix, github, type, milestone, footer, skip,
Topics {βοΈ}
kenny-y-dev mentioned 10/site-packages/_pytest/python_api assigned labels topic personal information `pytest break existing tests comment metadata assignees approx function type unsupported operand type type projects projects milestone function run open pytest macos 12 /users/milanwiedemann/ test float error earlier early error assert approx assert statement dict functionality approx fails approx related approx` fails def test_pytest_none_approx pytest_assertion plugin details failed pyenv/versions/3 4/lib/python3 faulty __repr__ subtraction operation function include dictionaries preferred direction current failure milestone relationships 4 pytest 7 pytest multiple values github approxmapping class 600981a sign error actual_result = { handling fix dict approx approx 'nonetype' values
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Questions {β}
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- I do agree that None shouldn't be approx-able based on what the function should be doing, though an early error on None may break existing tests, so should ApproxMapping instead be adjusted to better handle None?
- So should ApproxMapping instead be adjusted to better handle None?
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DiscussionForumPosting:
context:https://schema.org
headline:`pytest.approx` fails with `TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'`
articleBody:When using `approx` to test float and one of the objects in the `assert` statement contain `None` I see the following TypeError:
`TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'.
`
## Minimal example
### Test
```
import pytest
# Expecting assertion error with differing item
# Instead I see "TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'."
def test_pytest_none_approx():
actual_result = {"a": 1.2}
expected_result = {"a": None}
approx_expected_result = pytest.approx(expected_result)
assert approx_expected_result == actual_result
```
### Output
```
E AssertionError: assert approx({'a': 1.2 Β± 1.2e-06}) == {'a': None}
E (pytest_assertion plugin: representation of details failed: /Users/milanwiedemann/.pyenv/versions/3.10.4/lib/python3.10/site-packages/_pytest/python_api.py:270: TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'.
E Probably an object has a faulty __repr__.)
```
## `pip list`
```
Package Version
-------------- -------
attrs 22.2.0
exceptiongroup 1.1.0
iniconfig 2.0.0
packaging 23.0
pip 22.0.4
pluggy 1.0.0
pytest 7.2.1
setuptools 58.1.0
tomli 2.0.1
```
## Cersions of OS and pytest
- macOS 12.6.3
- python 3.10.4
- pytest 7.2.1
author:
url:https://github.com/milanwiedemann
type:Person
name:milanwiedemann
datePublished:2023-02-03T11:13:32.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:3
url:https://github.com/10702/pytest/issues/10702
context:https://schema.org
headline:`pytest.approx` fails with `TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'`
articleBody:When using `approx` to test float and one of the objects in the `assert` statement contain `None` I see the following TypeError:
`TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'.
`
## Minimal example
### Test
```
import pytest
# Expecting assertion error with differing item
# Instead I see "TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'."
def test_pytest_none_approx():
actual_result = {"a": 1.2}
expected_result = {"a": None}
approx_expected_result = pytest.approx(expected_result)
assert approx_expected_result == actual_result
```
### Output
```
E AssertionError: assert approx({'a': 1.2 Β± 1.2e-06}) == {'a': None}
E (pytest_assertion plugin: representation of details failed: /Users/milanwiedemann/.pyenv/versions/3.10.4/lib/python3.10/site-packages/_pytest/python_api.py:270: TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'.
E Probably an object has a faulty __repr__.)
```
## `pip list`
```
Package Version
-------------- -------
attrs 22.2.0
exceptiongroup 1.1.0
iniconfig 2.0.0
packaging 23.0
pip 22.0.4
pluggy 1.0.0
pytest 7.2.1
setuptools 58.1.0
tomli 2.0.1
```
## Cersions of OS and pytest
- macOS 12.6.3
- python 3.10.4
- pytest 7.2.1
author:
url:https://github.com/milanwiedemann
type:Person
name:milanwiedemann
datePublished:2023-02-03T11:13:32.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:3
url:https://github.com/10702/pytest/issues/10702
Person:
url:https://github.com/milanwiedemann
name:milanwiedemann
url:https://github.com/milanwiedemann
name:milanwiedemann
InteractionCounter:
interactionType:https://schema.org/CommentAction
userInteractionCount:3
interactionType:https://schema.org/CommentAction
userInteractionCount:3
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