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bpo-44142: drop redundant parantheses when unparsing tuples as assignment targets (GH-26156)

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Batuhan Taskaya 2021-05-16 16:33:22 +03:00 • committed by GitHub
parent 1a08c5ac49
commit 51cef8be8c
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4 changed files with 47 additions and 4 deletions
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9
Lib/ast.py
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@ -640,7 +640,8 @@ _INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1)
class _Precedence:
"""Precedence table that originated from python grammar."""
TUPLE = auto()
NAMED_EXPR = auto() # <target> := <expr1>
TUPLE = auto() # <expr1>, <expr2>
YIELD = auto() # 'yield', 'yield from'
TEST = auto() # 'if'-'else', 'lambda'
OR = auto() # 'or'
@ -838,7 +839,7 @@ class _Unparser(NodeVisitor):
self.traverse(node.value)
def visit_NamedExpr(self, node):
with self.require_parens(_Precedence.TUPLE, node):
with self.require_parens(_Precedence.NAMED_EXPR, node):
self.set_precedence(_Precedence.ATOM, node.target, node.value)
self.traverse(node.target)
self.write(" := ")
@ -859,6 +860,7 @@ class _Unparser(NodeVisitor):
def visit_Assign(self, node):
self.fill()
for target in node.targets:
self.set_precedence(_Precedence.TUPLE, target)
self.traverse(target)
self.write(" = ")
self.traverse(node.value)
@ -1030,6 +1032,7 @@ class _Unparser(NodeVisitor):
def _for_helper(self, fill, node):
self.fill(fill)
self.set_precedence(_Precedence.TUPLE, node.target)
self.traverse(node.target)
self.write(" in ")
self.traverse(node.iter)
@ -1315,7 +1318,7 @@ class _Unparser(NodeVisitor):
)
def visit_Tuple(self, node):
with self.delimit("(", ")"):
with self.require_parens(_Precedence.TUPLE, node):
self.items_view(self.traverse, node.elts)
unop = {"Invert": "~", "Not": "not", "UAdd": "+", "USub": "-"}