From b4b966ece26b4fc14c94fa9bccd831d5d5c93aab Mon Sep 17 00:00:00 2001 From: Nick Coghlan Date: Sat, 4 Jun 2016 14:40:03 -0700 Subject: Issue #19611: handle implicit parameters in inspect.signature inspect.signature now reports the implicit ``.0`` parameters generated by the compiler for comprehension and generator expression scopes as if they were positional-only parameters called ``implicit0``. Patch by Jelle Zijlstra. --- Lib/inspect.py | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'Lib/inspect.py') diff --git a/Lib/inspect.py b/Lib/inspect.py index 582bb0e7fa..45d2110106 100644 --- a/Lib/inspect.py +++ b/Lib/inspect.py @@ -2396,6 +2396,20 @@ class Parameter: if not isinstance(name, str): raise TypeError("name must be a str, not a {!r}".format(name)) + if name[0] == '.' and name[1:].isdigit(): + # These are implicit arguments generated by comprehensions. In + # order to provide a friendlier interface to users, we recast + # their name as "implicitN" and treat them as positional-only. + # See issue 19611. + if kind != _POSITIONAL_OR_KEYWORD: + raise ValueError( + 'implicit arguments must be passed in as {}'.format( + _POSITIONAL_OR_KEYWORD + ) + ) + self._kind = _POSITIONAL_ONLY + name = 'implicit{}'.format(name[1:]) + if not name.isidentifier(): raise ValueError('{!r} is not a valid parameter name'.format(name)) -- cgit v1.2.1