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Showing content from http://mail.python.org/pipermail/python-dev/2004-April/044612.html below:

[Python-Dev] dict.merge()?

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At the C level, 

	PyDict_Update(old, new) 

is just a shortcut for

	override=1
	PyDict_Merge(old, new, override)

C extensions can use PyDict_Merge directly with override=0, 
which keeps the current value in case of duplicate keys.

Python code can only use update, which means that override
is always true.  Is there a good reason this?

-jJ

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