diff options
| author | Tim Peters <tim.peters@gmail.com> | 2002-08-25 18:43:10 (GMT) |
|---|---|---|
| committer | Tim Peters <tim.peters@gmail.com> | 2002-08-25 18:43:10 (GMT) |
| commit | ea76c98014e7f99974e3dcdbe168d45762bf627d (patch) | |
| tree | f2729aa74a20f828711173c423fe1e44bdb70e62 /Doc/lib/libsets.tex | |
| parent | 93d8d48c15981ffbf9314d4f2aeeff008c227eb9 (diff) | |
| download | cpython-ea76c98014e7f99974e3dcdbe168d45762bf627d.zip cpython-ea76c98014e7f99974e3dcdbe168d45762bf627d.tar.gz cpython-ea76c98014e7f99974e3dcdbe168d45762bf627d.tar.bz2 | |
Implemented <, <=, >, >= for sets, giving subset and proper-subset
meanings. I did not add new, e.g., ispropersubset() methods; we're
going nuts on those, and, e.g., there was no "friendly name" for
== either.
Diffstat (limited to 'Doc/lib/libsets.tex')
| -rw-r--r-- | Doc/lib/libsets.tex | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/Doc/lib/libsets.tex b/Doc/lib/libsets.tex index 8ce62c889..c5239a4 100644 --- a/Doc/lib/libsets.tex +++ b/Doc/lib/libsets.tex @@ -74,9 +74,11 @@ the following operations: \lineii{\var{x} not in \var{s}} {test \var{x} for non-membership in \var{s}} \lineii{\var{s}.issubset(\var{t})} - {test whether every element in \var{s} is in \var{t}} + {test whether every element in \var{s} is in \var{t}; + \code{\var{s} <= \var{t}} is equivalent} \lineii{\var{s}.issuperset(\var{t})} - {test whether every element in \var{t} is in \var{s}} + {test whether every element in \var{t} is in \var{s}; + \code{\var{s} >= \var{t}} is equivalent} \hline \lineii{\var{s} | \var{t}} @@ -99,9 +101,14 @@ the following operations: {new set with a shallow copy of \var{s}} \end{tableii} -In addition to the above operations, both \class{Set} and \class{ImmutableSet} -support set to set equality comparisons. Two sets are equal if and only if -every element of each set is contained in the other. +In addition, both \class{Set} and \class{ImmutableSet} +support set to set comparisons. Two sets are equal if and only if +every element of each set is contained in the other (each is a subset +of the other). +A set is less than another set if and only if the first set is a proper +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). The following table lists operations available in \class{ImmutableSet} but not found in \class{Set}: |