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| -rw-r--r-- | Doc/ref/ref5.tex | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex index 89f9977..909e5bb 100644 --- a/Doc/ref/ref5.tex +++ b/Doc/ref/ref5.tex @@ -907,7 +907,10 @@ The operators \code{<}, \code{>}, \code{==}, \code{>=}, \code{<=}, and the values of two objects. The objects need not have the same type. If both are numbers, they are converted to a common type. Otherwise, objects of different types \emph{always} compare unequal, and are -ordered consistently but arbitrarily. +ordered consistently but arbitrarily. You can control comparison +behavior of objects of non-builtin types by defining a \code{__cmp__} +method or rich comparison methods like \code{__gt__}, described in +section~\ref{specialnames}. (This unusual definition of comparison was used to simplify the definition of operations like sorting and the \keyword{in} and @@ -952,7 +955,8 @@ otherwise defined.\footnote{Earlier versions of Python used a dictionary for emptiness by comparing it to \code{\{\}}.} \item -Most other types compare unequal unless they are the same object; +Most other objects of builtin types compare unequal unless they are +the same object; the choice whether one object is considered smaller or larger than another one is made arbitrarily but consistently within one execution of a program. |