Add new gotcha
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 50/100
- Issue type
- Documentation
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- python
- Domain
- documentation
Research direction
No file, test, or entry point is named in the issue. Start by locating the guide section for gotchas or list mutation, then add this += versus + case; it is done when the example and safer alternative appear in the appropriate documentation section.
Written by the indexing model from the issue text.
Description
Hi,
While running tests on my code I was doing something like:
class Data:
mylist = [1,2,3,4]
def test_function():
local_list = Data.mylist
local_list+=new_list
# Do stuff with
and there are multiple tests using mylist. This is going to modify the list instead of creating a new one, an unexpected behavior of +=. This will let one test talk to the tests happening later. The safer approach is:
class Data:
mylist = [1,2,3,4]
def test_function():
local_list =new_list + Data.mylist
# Do stuff with
here + will copy the list. Could you please add this case?
Cheers.
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