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Guido van Rossum 1993-05-12 08:53:36 +00:00
parent 6ac258d381
commit b2c6556fb0
7 changed files with 159 additions and 165 deletions
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Doc/ref/ref5.tex
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@ -176,8 +176,9 @@ The key/datum pairs are evaluated from left to right to define the
entries of the dictionary: each key object is used as a key into the
dictionary to store the corresponding datum.
Keys must be strings, otherwise a \verb\TypeError\ exception is
raised. Clashes between duplicate keys are not detected; the last
Restrictions on the types of the key values are listed earlier in
section \ref{types}.
Clashes between duplicate keys are not detected; the last
datum (textually rightmost in the display) stored for a given key
value prevails.
\exindex{TypeError}
@ -565,10 +566,10 @@ corresponding items.
Mappings (dictionaries) are compared through lexicographic
comparison of their sorted (key, value) lists.%
\footnote{This is expensive since it requires sorting the keys first,
but about the only sensible definition. It was tried to compare
dictionaries by identity only, but this caused surprises because
people expected to be able to test a dictionary for emptiness by
comparing it to {\tt \{\}}.}
but about the only sensible definition. An earlier version of Python
compared dictionaries by identity only, but this caused surprises
because people expected to be able to test a dictionary for emptiness
by comparing it to {\tt \{\}}.}
\item
Most other types compare unequal unless they are the same object;