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[IMPR] Give a more informative assert message in package_versions

Change-Id: Ibdde29f519c97fffe5d75909f334585a8ff6f727
---
M pywikibot/bot.py
M pywikibot/version.py
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/pywikibot/bot.py b/pywikibot/bot.py
index 96ea8c4..f03ed48 100644
--- a/pywikibot/bot.py
+++ b/pywikibot/bot.py
@@ -387,9 +387,8 @@
     if config.verbose_output:
         check_package_list += all_modules
 
-    packages = version.package_versions(check_package_list)
-
     log('PACKAGES:')
+    packages = version.package_versions(check_package_list)
     for name in sorted(packages.keys()):
         info = packages[name]
         info.setdefault('path',
diff --git a/pywikibot/version.py b/pywikibot/version.py
index 6e5557c..45a77d0 100644
--- a/pywikibot/version.py
+++ b/pywikibot/version.py
@@ -530,7 +530,9 @@
                 path = path[0:path.index('__init__.py')]
 
             info['path'] = path
-            assert path not in paths, 'Path of the package is in defined paths'
+            assert path not in paths, \
+                   'Path {} of the package {} is in defined paths as {}' \
+                   .format(path, name, paths[path])
             paths[path] = name
 
         if '__version__' in package.__dict__:

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