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Added intern()

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Guido van Rossum 1997-03-03 16:03:27 +00:00
parent 38e2ec4f14
commit 3978d75cca
2 changed files with 26 additions and 0 deletions
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13
Doc/lib/libfuncs.tex
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@ -212,6 +212,19 @@ module from which it is called).
the backslash convention. the backslash convention.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{intern}{string}
Enter \var{string} in the table of ``interned'' strings and return
the interned string -- which is \var{string} itself or a copy.
Interning strings is useful to gain a little performance on
dictionary lookup -- if the keys in a dictionary are interned, and
the lookup key is interned, the key comparisons (after hashing) can
be done by a pointer compare instead of a string compare. Normally,
the names used in Python programs are automatically interned, and
the dictionaries used to hold module, class or instance attributes
have interned keys. Interned strings are immortal (i.e. never get
garbage collected).
\end{funcdesc}
\begin{funcdesc}{int}{x} \begin{funcdesc}{int}{x}
Convert a number to a plain integer. The argument may be a plain or Convert a number to a plain integer. The argument may be a plain or
long integer or a floating point number. Conversion of floating long integer or a floating point number. Conversion of floating

13
Doc/libfuncs.tex
View file

@ -212,6 +212,19 @@ module from which it is called).
the backslash convention. the backslash convention.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{intern}{string}
Enter \var{string} in the table of ``interned'' strings and return
the interned string -- which is \var{string} itself or a copy.
Interning strings is useful to gain a little performance on
dictionary lookup -- if the keys in a dictionary are interned, and
the lookup key is interned, the key comparisons (after hashing) can
be done by a pointer compare instead of a string compare. Normally,
the names used in Python programs are automatically interned, and
the dictionaries used to hold module, class or instance attributes
have interned keys. Interned strings are immortal (i.e. never get
garbage collected).
\end{funcdesc}
\begin{funcdesc}{int}{x} \begin{funcdesc}{int}{x}
Convert a number to a plain integer. The argument may be a plain or Convert a number to a plain integer. The argument may be a plain or
long integer or a floating point number. Conversion of floating long integer or a floating point number. Conversion of floating