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| -rw-r--r-- | Doc/lib/libstdtypes.tex | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex index 66e5702..7d69b64 100644 --- a/Doc/lib/libstdtypes.tex +++ b/Doc/lib/libstdtypes.tex @@ -1185,6 +1185,10 @@ subset of the second set (is a subset, but is not equal). A set is greater than another set if and only if the first set is a proper superset of the second set (is a superset, but is not equal). +Instanceas of \class{set} are compared to instances of \class{frozenset} based +on their members. For example, \samp{set('abc') == frozenset('abc')} returns +\code{True}. + The subset and equality comparisons do not generalize to a complete ordering function. For example, any two disjoint sets are not equal and are not subsets of each other, so \emph{all} of the following return @@ -1195,11 +1199,9 @@ Accordingly, sets do not implement the \method{__cmp__} method. Since sets only define partial ordering (subset relationships), the output of the \method{list.sort()} method is undefined for lists of sets. -For convenience in implementing sets of sets, the \method{__contains__()}, -\method{remove()}, and \method{discard()} methods automatically match -instances of the \class{set} class their \class{frozenset} counterparts -inside a set. For example, \code{set('abc') in set([frozenset('abc')])} -returns \code{True}. +Binary operations that mix \class{set} instances with \class{frozenset} +return the type of the first operand. For example: +\samp{frozenset('ab') | set('bc')} returns an instance of \class{frozenset}. The following table lists operations available for \class{set} that do not apply to immutable instances of \class{frozenset}: |