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demandimport: prefer loaded module over package attribute (issue5617)
authorYuya Nishihara <yuya@tcha.org>
Sun, 16 Jul 2017 17:38:39 +0900
changeset 33531 9cbbf9118c6c
parent 33530 05e3fa254b6b
child 33532 d645fdfb749f
demandimport: prefer loaded module over package attribute (issue5617) In general, the attribute of the same name is overwritten by executing an import statement. import a.b print(a.b.c) # 'c' of a/b/__init__.py from a.b.c import d print(a.b.c) # a/b/c.py However, this appears not true for the scenario described in the test case, and surprisingly, "from a.b.c import d" works even if "a.b.c" is not a module. This patch works around the problem by taking the right module from sys.modules if available.
hgdemandimport/demandimportpy2.py file | annotate | diff | comparison | revisions
tests/test-extension.t file | annotate | diff | comparison | revisions 
--- a/hgdemandimport/demandimportpy2.py	Sun Jul 16 17:19:22 2017 +0900
+++ b/hgdemandimport/demandimportpy2.py	Sun Jul 16 17:38:39 2017 +0900
@@ -227,10 +227,14 @@
             # recurse down the module chain, and return the leaf module
             mod = rootmod
             for comp in modname.split('.')[1:]:
-                if getattr(mod, comp, nothing) is nothing:
-                    setattr(mod, comp, _demandmod(comp, mod.__dict__,
-                                                  mod.__dict__, level=1))
-                mod = getattr(mod, comp)
+                obj = getattr(mod, comp, nothing)
+                if obj is nothing:
+                    obj = _demandmod(comp, mod.__dict__, mod.__dict__, level=1)
+                    setattr(mod, comp, obj)
+                elif mod.__name__ + '.' + comp in sys.modules:
+                    # prefer loaded module over attribute (issue5617)
+                    obj = sys.modules[mod.__name__ + '.' + comp]
+                mod = obj
             return mod
 
         if level >= 0:
--- a/tests/test-extension.t	Sun Jul 16 17:19:22 2017 +0900
+++ b/tests/test-extension.t	Sun Jul 16 17:38:39 2017 +0900
@@ -337,6 +337,23 @@
   > from .legacy import detail as legacydetail
   > EOF
 
+Setup package that re-exports an attribute of its submodule as the same
+name. This leaves 'shadowing.used' pointing to 'used.detail', but still
+the submodule 'used' should be somehow accessible. (issue5617)
+
+  $ mkdir -p $TESTTMP/extlibroot/shadowing
+  $ cat > $TESTTMP/extlibroot/shadowing/used.py <<EOF
+  > detail = "this is extlibroot.shadowing.used"
+  > EOF
+  $ cat > $TESTTMP/extlibroot/shadowing/proxied.py <<EOF
+  > from __future__ import absolute_import
+  > from extlibroot.shadowing.used import detail
+  > EOF
+  $ cat > $TESTTMP/extlibroot/shadowing/__init__.py <<EOF
+  > from __future__ import absolute_import
+  > from .used import detail as used
+  > EOF
+
 Setup extension local modules to be imported with "absolute_import"
 feature.
 
@@ -429,6 +446,7 @@
   > from extlibroot.lsub1.lsub2 import used as lused, unused as lunused
   > from extlibroot.lsub1.lsub2.called import func as lfunc
   > from extlibroot.recursedown import absdetail, legacydetail
+  > from extlibroot.shadowing import proxied
   > 
   > def uisetup(ui):
   >     result = []
@@ -436,6 +454,7 @@
   >     result.append(lfunc())
   >     result.append(absdetail)
   >     result.append(legacydetail)
+  >     result.append(proxied.detail)
   >     ui.write('LIB: %s\n' % '\nLIB: '.join(result))
   > EOF
 
@@ -446,6 +465,7 @@
   LIB: this is extlibroot.lsub1.lsub2.called.func()
   LIB: this is extlibroot.recursedown.abs.used
   LIB: this is extlibroot.recursedown.legacy.used
+  LIB: this is extlibroot.shadowing.used
   ABS: this is absextroot.xsub1.xsub2.used
   ABS: this is absextroot.xsub1.xsub2.called.func()
 
@@ -454,6 +474,7 @@
   LIB: this is extlibroot.lsub1.lsub2.called.func()
   LIB: this is extlibroot.recursedown.abs.used
   LIB: this is extlibroot.recursedown.legacy.used
+  LIB: this is extlibroot.shadowing.used
   REL: this is absextroot.xsub1.xsub2.used
   REL: this is absextroot.xsub1.xsub2.called.func()
   REL: this relimporter imports 'this is absextroot.relimportee'
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