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| -rw-r--r-- | Doc/lib/libdatetime.tex | 64 |
1 files changed, 28 insertions, 36 deletions
diff --git a/Doc/lib/libdatetime.tex b/Doc/lib/libdatetime.tex index 4357505..4327312 100644 --- a/Doc/lib/libdatetime.tex +++ b/Doc/lib/libdatetime.tex @@ -219,12 +219,25 @@ Supported operations: {(1)} \lineiii{\var{t1} = \var{t2} * \var{i} or \var{t1} = \var{i} * \var{t2}} {Delta multiplied by an integer or long. - Afterwards \var{t1} // i == \var{t2} is true, provided i != 0. + Afterwards \var{t1} // i == \var{t2} is true, provided \code{i != 0}. In general, \var{t1} * i == \var{t1} * (i-1) + \var{t1} is true.} {(1)} \lineiii{\var{t1} = \var{t2} // \var{i}} {The floor is computed and the remainder (if any) is thrown away.} {(2)} + \lineiii{+\var{t1}} + {Returns a \class{timedelta} object with the same value.} + {} + \lineiii{-\var{t1}} + {equivalent to \class{timedelta}(-\var{t1.days}, -\var{t1.seconds}, + -\var{t1.microseconds}),and to \var{t1}* -1.} + {(1)(3)} + \lineiii{abs(\var{t})} + {equivalent to +\var{t} when \code{t.days >= 0}, and to -\var{t} when + \code{t.days < 0}.} + {(1)} + + \end{tableiii} \noindent Notes: @@ -235,45 +248,24 @@ This is exact, but may overflow. \item[(2)] Division by 0 raises \exception{ZeroDivisionError}. -\end{description} - - - - -\begin{itemize} - \item - certain additions and subtractions with date, datetime, and datimetz - objects (see below) - - \item - +timedelta -> timedelta - Returns a \class{timedelta} object with the same value. - \item - -timedelta -> timedelta - -t is equivalent to timedelta(-t.days, -t.seconds, -t.microseconds), - and to t*-1. This is exact, but may overflow (for example, - -timedelta.max is not representable as a \class{timedelta} object). +\item[(3)] +-\var{timedelta.max} is not representable as a \class{timedelta} object). - \item - \code{abs(timedelta) -> timedelta}: - \code{abs(t)} is equivalent to +t when \code{t.days >= 0}, and to -t when - \code{t.days < 0}. This is exact, and cannot overflow. +\end{description} - \item - comparison of \class{timedelta} to timedelta; the \class{timedelta} representing - the smaller duration is considered to be the smaller timedelta +In addition to the operations listed above \class{timedelta} objects +support certain additions and subtractions with \class{date}, +\class{datetime}, and \class{datimetz} objects (see below). - \item - hash, use as dict key +Comparisons of \class{timedelta} objects are supported with the +\class{timedelta} object representing the smaller duration considered +to be the smaller timedelta. - \item - efficient pickling - - \item - in Boolean contexts, a \class{timedelta} object is considered to be true - if and only if it isn't equal to \code{timedelta(0)} -\end{itemize} +\class{timedelta} objects are hashable (usable as dictionary key), +support efficient pickling, and in Boolean contexts, a \class{timedelta} +object is considered to be true if and only if it isn't equal to +\code{timedelta(0)}. \subsection{\class{date} Objects \label{datetime-date}} @@ -922,7 +914,7 @@ When \code{None} is passed, it's up to the class designer to decide the best response. For example, returning \code{None} is appropriate if the class wishes to say that timetz objects don't participate in the \class{tzinfo} protocol. In other applications, it may be more useful -for \code{utcoffset(None}} to return the standard UTC offset. +for \code{utcoffset(None)} to return the standard UTC offset. When a \class{datetimetz} object is passed in response to a \class{datetimetz} method, \code{dt.tzinfo} is the same object as |