It would be convenient if replacing items in a dictionary returns the
new dictionary, in a manner analogous to str.replace(). What do you
think?
::
# Current behavior
x = {'key1': 1}
x.update(key1=3) == None
x == {'key1': 3} # Original variable has changed
# Possible behavior
x = {'key1': 1}
x.replace(key1=3) == {'key1': 3}
x == {'key1': 1} # Original variable is unchanged
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