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authorNick Coghlan <ncoghlan@gmail.com>2018-03-25 13:03:10 (GMT)
committerGitHub <noreply@github.com>2018-03-25 13:03:10 (GMT)
commitd5d9e02dd3c6df06a8dd9ce75ee9b52976420a8b (patch)
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bpo-33053: -m now adds *starting* directory to sys.path (GH-6231)
Historically, -m added the empty string as sys.path zero, meaning it resolved imports against the current working directory, the same way -c and the interactive prompt do. This changes the sys.path initialisation to add the *starting* working directory as sys.path[0] instead, such that changes to the working directory while the program is running will have no effect on imports when using the -m switch.
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diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst
index 0b5ad00..e0c19cf 100644
--- a/Doc/whatsnew/3.7.rst
+++ b/Doc/whatsnew/3.7.rst
@@ -421,6 +421,12 @@ Other Language Changes
writable.
(Contributed by Nathaniel J. Smith in :issue:`30579`.)
+* When using the :option:`-m` switch, ``sys.path[0]`` is now eagerly expanded
+ to the full starting directory path, rather than being left as the empty
+ directory (which allows imports from the *current* working directory at the
+ time when an import occurs)
+ (Contributed by Nick Coghlan in :issue:`33053`.)
+
New Modules
===========
@@ -1138,6 +1144,11 @@ Changes in Python behavior
parentheses can be omitted only on calls.
(Contributed by Serhiy Storchaka in :issue:`32012` and :issue:`32023`.)
+* When using the ``-m`` switch, the starting directory is now added to sys.path,
+ rather than the current working directory. Any programs that are found to be
+ relying on the previous behaviour will need to be updated to manipulate
+ :data:`sys.path` appropriately.
+
Changes in the Python API
-------------------------