Skip to content

Clarify that yoda dependency specifiers are not allowed #2051

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

Closed
danyeaw wants to merge 1 commit into from
Closed

Clarify that yoda dependency specifiers are not allowed #2051

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
13 changes: 8 additions & 5 deletions source/specifications/dependency-specifiers.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -93,9 +93,8 @@ environments::
'implementation_name' | 'implementation_version' |
'extra' | 'extras' | 'dependency_groups' # ONLY when defined by a containing layer
)
marker_var = wsp* (env_var | python_str)
marker_expr = marker_var marker_op marker_var
| wsp* '(' marker wsp* ')'
marker_expr = env_var wsp* marker_op wsp* python_str
| '(' marker ')'
marker_and = marker_expr wsp* 'and' marker_expr
| marker_expr
marker_or = marker_and wsp* 'or' marker_and
Expand Down Expand Up @@ -523,8 +522,7 @@ The complete parsley grammar::
'implementation_name' | 'implementation_version' |
'extra' | 'extras' | 'dependency_groups' # ONLY when defined by a containing layer
):varname -> lookup(varname)
marker_var = wsp* (env_var | python_str)
marker_expr = marker_var:l marker_op:o marker_var:r -> (o, l, r)
marker_expr = wsp* env_var:l wsp* marker_op:o wsp* python_str:r -> (o, l, r)
| wsp* '(' marker:m wsp* ')' -> m
marker_and = marker_expr:l wsp* 'and' marker_expr:r -> ('and', l, r)
| marker_expr:m -> m
Expand Down Expand Up @@ -630,6 +628,9 @@ A test program - if the grammar is in a string ``grammar``:
"name@http://foo.com",
"name [fred,bar] @ http://foo.com ; python_version=='2.7'",
"name[quux, strange];python_version<'2.7' and platform_version=='2'",
"name; python_version > '3.10'",
# Yoda specifiers are rejected
# "name; '3.10' < python_version",
"name; os_name=='a' or os_name=='b'",
# Should parse as (a and b) or c
"name; os_name=='a' and os_name=='b' or os_name=='c'",
Expand Down Expand Up @@ -707,6 +708,8 @@ History
work. [#marker_comparison_logic]_
- January 2026: fix outdated references to other documents that were
inadvertently retained from :pep:`508`
- May 2026: Clarify that Yoda specifiers like ``'3.10' < python_version`` are not
allowed.


References
Expand Down