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-rw-r--r--Doc/library/os.rst9
1 files changed, 8 insertions, 1 deletions
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 1d4b1e1..fbc7edb 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -142,7 +142,8 @@ process and user.
synchronized (modify :data:`environb` updates :data:`environ`, and vice
versa).
- Availability: Unix.
+ :data:`environb` is only available if :data:`supports_bytes_environ` is
+ True.
.. versionadded:: 3.2
@@ -457,6 +458,12 @@ process and user.
Availability: Unix, Windows.
+.. data:: supports_bytes_environ
+
+ True if the native OS type of the environment is bytes (eg. False on
+ Windows).
+
+
.. function:: umask(mask)
Set the current numeric umask and return the previous umask.