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Feature #18242
open
Parser makes multiple assignment sad in confusing way
Status:
Open
Assignee:
-
Target version:
-
Description
Example:
a, b = 2, 1 if 1 < 2 # Works
a, b = [2, 1] if 1 < 2 # Works
(a, b) = 2, 1 if 1 < 2 # Works
(a, b) = [2, 1] if 1 < 2 # Works
(a, b = [2, 1]) if 1 < 2 # Works
a, b = 2, 1 unless 2 < 1 # Works
a, b = [2, 1] unless 2 < 1 # Works
(a, b) = 2, 1 unless 2 < 1 # Works
(a, b) = [2, 1] unless 2 < 1 # Works
(a, b = [2, 1]) unless 2 < 1 # Works
1 < 2 and a, b = 2, 1 # SyntaxError
1 < 2 and a, b = [2, 1] # SyntaxError
1 < 2 and (a, b) = 2, 1 # SyntaxError
1 < 2 and (a, b) = [2, 1] # SyntaxError
(1 < 2) and a, b = 2, 1 # SyntaxError
(1 < 2) and a, b = [2, 1] # SyntaxError
(1 < 2) and (a, b) = 2, 1 # SyntaxError
(1 < 2) and (a, b) = [2, 1] # SyntaxError
1 < 2 and (a, b = 2, 1) # Works
1 < 2 and (a, b = [2, 1]) # Works
2 < 1 or a, b = 2, 1 # SyntaxError
2 < 1 or a, b = [2, 1] # SyntaxError
2 < 1 or (a, b) = 2, 1 # SyntaxError
2 < 1 or (a, b) = [2, 1] # SyntaxError
(2 < 1) or a, b = 2, 1 # SyntaxError
(2 < 1) or a, b = [2, 1] # SyntaxError
(2 < 1) or (a, b) = 2, 1 # SyntaxError
(2 < 1) or (a, b) = [2, 1] # SyntaxError
2 < 1 or (a, b = 2, 1) # Works
2 < 1 or (a, b = [2, 1]) # Works
Based on the precedence rules I've been able to find, all of these should work.
Believe it or not, there are cases where using and or or in a stanza of lines is much more readable.
Should the parser allow all of these? See attached driver script to reproduce this output.
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