Skip to content

PEP 483: fixes issue of getting wrong Error #2143

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
gvanrossum merged 1 commit into from
Nov 14, 2021
Merged

PEP 483: fixes issue of getting wrong Error #2143

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion pep-0483.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -486,7 +486,7 @@ replaced by the most-derived base class among ``t1``, etc. Examples:
Note that the type checker will reject this function::

def concat(first: U, second: U) -> U:
return x + y # Error: can't concatenate str and bytes
return first + second # Error: can't concatenate str and bytes

For such cases where parameters could change their types only simultaneously
one should use constrained type variables.
Expand Down