diff options
Diffstat (limited to 'Doc/ref/ref5.tex')
| -rw-r--r-- | Doc/ref/ref5.tex | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex index 7857e95..59ba90a 100644 --- a/Doc/ref/ref5.tex +++ b/Doc/ref/ref5.tex @@ -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; |