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-rw-r--r--Doc/library/zipfile.rst10
1 files changed, 8 insertions, 2 deletions
diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst
index 465d786cbd..1d23a7c4d2 100644
--- a/Doc/library/zipfile.rst
+++ b/Doc/library/zipfile.rst
@@ -219,8 +219,14 @@ ZipFile Objects
.. note::
- Objects returned by :meth:`.open` can operate independently of the
- ZipFile.
+ If the ZipFile was created by passing in a file-like object as the first
+ argument to the constructor, then the object returned by :meth:`.open` shares the
+ ZipFile's file pointer. Under these circumstances, the object returned by
+ :meth:`.open` should not be used after any additional operations are performed
+ on the ZipFile object. If the ZipFile was created by passing in a string (the
+ filename) as the first argument to the constructor, then :meth:`.open` will
+ create a new file object that will be held by the ZipExtFile, allowing it to
+ operate independently of the ZipFile.
.. note::