Issue #16863: Explain difference between text and 2.7 behavior.

e726603f · Terry Jan Reedy · 455a2462 · e726603f
Commit e726603f authored Oct 22, 2014 by Terry Jan Reedy
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Doc/howto/argparse.rst Doc/howto/argparse.rst +2 -0

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--- a/Doc/howto/argparse.rst
+++ b/Doc/howto/argparse.rst
@@ -8,6 +8,8 @@ Argparse Tutorial

 This tutorial is intended to be a gentle introduction to :mod:`argparse`, the
 recommended command-line parsing module in the Python standard library.
+This was written for argparse in Python 3. A few details are different in 2.x,
+especially some exception messages, which were improved in 3.x.

 .. note::