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Issue #20144: Argument Clinic now supports simple constants as parameter

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default values.  inspect.Signature correspondingly supports them in
__text_signature__ fields for builtins.
This commit is contained in:
Larry Hastings 2014-01-07 11:53:01 -08:00
parent 0bce6e7462
commit 16c5191ab3
6 changed files with 152 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

56
Lib/inspect.py
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@ -1974,18 +1974,60 @@ class Signature:
parameters = []
empty = Parameter.empty
invalid = object()
def parse_attribute(node):
if not isinstance(node.ctx, ast.Load):
return None
value = node.value
o = parse_node(value)
if o is invalid:
return invalid
if isinstance(value, ast.Name):
name = o
if name not in sys.modules:
return invalid
o = sys.modules[name]
return getattr(o, node.attr, invalid)
def parse_node(node):
if isinstance(node, ast.arg):
if node.annotation != None:
raise ValueError("Annotations are not currently supported")
return node.arg
if isinstance(node, ast.Num):
return node.n
if isinstance(node, ast.Str):
return node.s
if isinstance(node, ast.NameConstant):
return node.value
if isinstance(node, ast.Attribute):
return parse_attribute(node)
if isinstance(node, ast.Name):
if not isinstance(node.ctx, ast.Load):
return invalid
return node.id
return invalid
def p(name_node, default_node, default=empty):
name = name_node.arg
if isinstance(default_node, ast.Num):
default = default.n
elif isinstance(default_node, ast.NameConstant):
default = default_node.value
name = parse_node(name_node)
if name is invalid:
return None
if default_node:
o = parse_node(default_node)
if o is invalid:
return None
default = o if o is not invalid else default
parameters.append(Parameter(name, kind, default=default, annotation=empty))
# non-keyword-only parameters
for name, default in reversed(list(itertools.zip_longest(reversed(f.args.args), reversed(f.args.defaults), fillvalue=None))):
args = reversed(f.args.args)
defaults = reversed(f.args.defaults)
iter = itertools.zip_longest(args, defaults, fillvalue=None)
for name, default in reversed(list(iter)):
p(name, default)
# *args