From 7dd9763452bfada736b96f88494caa73035d18c2 Mon Sep 17 00:00:00 2001
From: Michael Merickel <michael@merickel.org>
Date: Sat, 08 Jul 2017 20:01:48 +0200
Subject: [PATCH] fix circular import in pyramid.viewderivers
---
pyramid/util.py | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/pyramid/util.py b/pyramid/util.py
index 2827884..97e761c 100644
--- a/pyramid/util.py
+++ b/pyramid/util.py
@@ -17,6 +17,8 @@
)
from pyramid.compat import (
+ getargspec,
+ im_func,
is_nonstr_iter,
integer_types,
string_types,
@@ -645,3 +647,53 @@
return (pattern[0] == "." and
(host.endswith(pattern) or host == pattern[1:]) or
pattern == host)
+
+
+def takes_one_arg(callee, attr=None, argname=None):
+ ismethod = False
+ if attr is None:
+ attr = '__call__'
+ if inspect.isroutine(callee):
+ fn = callee
+ elif inspect.isclass(callee):
+ try:
+ fn = callee.__init__
+ except AttributeError:
+ return False
+ ismethod = hasattr(fn, '__call__')
+ else:
+ try:
+ fn = getattr(callee, attr)
+ except AttributeError:
+ return False
+
+ try:
+ argspec = getargspec(fn)
+ except TypeError:
+ return False
+
+ args = argspec[0]
+
+ if hasattr(fn, im_func) or ismethod:
+ # it's an instance method (or unbound method on py2)
+ if not args:
+ return False
+ args = args[1:]
+
+ if not args:
+ return False
+
+ if len(args) == 1:
+ return True
+
+ if argname:
+
+ defaults = argspec[3]
+ if defaults is None:
+ defaults = ()
+
+ if args[0] == argname:
+ if len(args) - len(defaults) == 1:
+ return True
+
+ return False
--
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