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Kirill Smelkov
cpython
Commits
6005a344
Commit
6005a344
authored
Dec 30, 2002
by
Raymond Hettinger
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Added markup upto line 233.
parent
497e5c4f
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-58
Doc/lib/libdatetime.tex
Doc/lib/libdatetime.tex
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Doc/lib/libdatetime.tex
View file @
6005a344
...
...
@@ -8,6 +8,9 @@
\moduleauthor
{
Tim Peters
}{
tim@zope.com
}
\sectionauthor
{
Tim Peters
}{
tim@zope.com
}
\sectionauthor
{
A.M. Kuchling
}{
amk@amk.ca
}
\sectionauthor
{
Raymond D. Hettinger
}{
python@rcn.com
}
\versionadded
{
2.3
}
\newcommand
{
\Naive
}{
Na
\"
ive
}
\newcommand
{
\naive
}{
na
\"
ive
}
...
...
@@ -50,6 +53,10 @@ The \module{datetime} module exports the following constants:
or
\class
{
datetimetz
}
object.
\constant
{
MAXYEAR
}
is
\code
{
9999
}
.
\end{datadesc}
\begin{seealso}
\seemodule
{
calendar
}{
General calandar related functions.
}
\seemodule
{
time
}{
Time access and conversions.
}
\end{seealso}
\subsection
{
Available Types
}
...
...
@@ -125,24 +132,25 @@ object
datetimetz
\end{verbatim}
\subsection
{
\class
{
timedelta
}
\label
{
datetime-timedelta
}}
\subsection
{
\class
{
timedelta
}
Objects
\label
{
datetime-timedelta
}}
\begin{classdesc}
{
timedelta
}{
days=0, seconds=0, microseconds=0,
milliseconds=0, minutes=0, hours=0, weeks=0
}
A
\class
{
timedelta
}
object represents a duration, the difference
between two dates or times.
\begin{funcdesc}
{
timedelta
}{
days=0, seconds=0, microseconds=0,
milliseconds=0, minutes=0, hours=0, weeks=0
}
All arguments are optional. Arguments may be ints, longs, or floats,
and may be positive or negative.
Only
days, seconds and microseconds are stored internally. Arguments
are converted to those units:
Only
\var
{
days
}
,
\var
{
seconds
}
and
\var
{
microseconds
}
are stored
internally. Arguments
are converted to those units:
\begin{verbatim}
A millisecond is converted to 1000 microseconds.
A minute is converted to 60 seconds.
An hour is converted to 3600 seconds.
A week is converted to 7 days.
\end{verbatim}
and days, seconds and microseconds are then normalized so that the
representation is unique, with
...
...
@@ -171,69 +179,60 @@ between two dates or times.
(-1, 86399, 999999)
\end{verbatim}
\end{
func
desc}
\end{
class
desc}
Class attributes are:
\begin{memberdesc}
{
min
}
The most negative
\class
{
timedelta
}
object,
\code
{
timedelta(-999999999)
}
.
\end{memberdesc}
\begin{memberdesc}
{
max
}
The most positive
\class
{
timedelta
}
object,
\begin{tableii}
{
c|l
}{
code
}{
Attribute
}{
Value
}
\lineii
{
min
}{
The most negative
\class
{
timedelta
}
object,
\code
{
timedelta(-999999999)
}}
\lineii
{
max
}{
The most positive
\class
{
timedelta
}
object,
timedelta(days=999999999, hours=23, minutes=59, seconds=59,
microseconds=999999)
\end{memberdesc}
\begin{memberdesc}
{
resolution
}
The smallest possible difference between non-equal timedelta
objects,
\code
{
timedelta(microseconds=1)
}
.
\end{memberdesc}
microseconds=999999)
}
\lineii
{
resolution
}{
The smallest possible difference between non-equal
\class
{
timedelta
}
objects,
\code
{
timedelta(microseconds=1)
}}
\end{tableii}
Note that, because of normalization, timedelta.max > -timedelta.min.
-timedelta.max is not representable as a
\class
{
timedelta
}
object.
Instance attributes (read-only):
\begin{memberdesc}
{
days
}
Between -999999999 and 999999999 inclusive.
\end{memberdesc}
\begin{memberdesc}
{
seconds
}
Between 0 and 86399 inclusive.
\end{memberdesc}
\begin{memberdesc}
{
microseconds
}
Between 0 and 999999 inclusive.
\end{memberdesc}
\begin{tableii}
{
c|l
}{
code
}{
Attribute
}{
Value
}
\lineii
{
days
}{
Between -999999999 and 999999999 inclusive
}
\lineii
{
seconds
}{
Between 0 and 86399 inclusive
}
\lineii
{
microseconds
}{
Between 0 and 999999 inclusive
}
\end{tableii}
Supported operations:
\begin{itemize}
\item
timedelta + timedelta -> timedelta
This is exact, but may overflow. After
t1 = t2 + t3
t1-t2 == t3 and t1-t3 == t2 are true.
\begin{tableiii}
{
c|l|c
}{
code
}{
Operation
}{
Result
}{
Notes
}
\lineii
{
t1 = t2 + t3
}{
Sum of t2 and t3.
Afterwards t1-t2 == t3 and t1-t3 == t2 are true.
}{
(1)
}
\lineii
{
t1 = t2 - t3
}{
Difference of t2 and t3. Afterwards t1 = t2 - t3 and
t2 == t1 + t3 are true.
}{
(1)
}
\lineii
{
t1 = t2 * i or t1 = i * t2
}{
Delta multiplied by an integer or long.
Afterwards t1 // i == t2 is true, provided i != 0.
In general, t1 * i == t1 * (i-1) + t1 is true.
}{
(1)
}
\lineii
{
t1 = t2 // i
}{
The floor is computed and the remainder (if any) is
thrown away.
}{
(2)
}
\end{tableii}
\noindent
Notes:
\item
timedelta - timedelta -> timedelta
This is exact, but may overflow. After
t1 = t2 - t3
t2 == t1 + t3 is true.
\begin{description}
\item
[(1)]
This is exact, but may overflow.
\item
timedelta * (int or long) -> timedelta
(int or long) * timedelta -> timedelta
This is exact, but may overflow. After
t1 = t2 * i
t1 // i == t2 is true, provided i != 0. In general,
t * i == t * (i-1) + t
is true.
\item
[(2)]
Division by 0 raises
\exception
{
ZeroDivisionError
}
.
\end{description}
\item
timedelta // (int or long) -> timedelta
The floor is computed and the remainder (if any) is thrown away.
Division by 0 raises
\exception
{
ZeroDivisionError
}
.
\begin{itemize}
\item
certain additions and subtractions with date, datetime, and datimetz
objects (see below)
...
...
@@ -269,7 +268,7 @@ Supported operations:
\end{itemize}
\subsection
{
\class
{
date
}
\label
{
datetime-date
}}
\subsection
{
\class
{
date
}
Objects
\label
{
datetime-date
}}
A
\class
{
date
}
object represents a date (year, month and day) in an idealized
calendar, the current Gregorian calendar indefinitely extended in both
...
...
@@ -471,7 +470,7 @@ Instance methods:
\end{methoddesc}
\subsection
{
\class
{
datetime
}
\label
{
datetime-datetime
}}
\subsection
{
\class
{
datetime
}
Objects
\label
{
datetime-datetime
}}
A
\class
{
datetime
}
object is a single object containing all the
information from a
\class
{
date
}
object and a time object. Like a
...
...
@@ -737,7 +736,7 @@ Instance methods:
\end{methoddesc}
\subsection
{
\class
{
time
}
\label
{
datetime-time
}}
\subsection
{
\class
{
time
}
Objects
\label
{
datetime-time
}}
A time object represents an idealized time of day, independent of day
and timezone.
...
...
@@ -831,7 +830,7 @@ Instance methods:
\end{methoddesc}
\subsection
{
\class
{
tzinfo
}
\label
{
datetime-tzinfo
}}
\subsection
{
\class
{
tzinfo
}
Objects
\label
{
datetime-tzinfo
}}
\class
{
tzinfo
}
is an abstract base clase, meaning that this class
should not be instantiated directly. You need to derive a concrete
...
...
@@ -905,7 +904,7 @@ Example \class{tzinfo} classes:
\verbatiminput
{
tzinfo-examples.py
}
\subsection
{
\class
{
timetz
}
\label
{
datetime-timetz
}}
\subsection
{
\class
{
timetz
}
Objects
\label
{
datetime-timetz
}}
A time object represents a (local) time of day, independent of any
particular day, and subject to adjustment via a
\class
{
tzinfo
}
object.
...
...
@@ -1032,7 +1031,7 @@ Instance methods:
\subsection
{
\class
{
datetimetz
}
\label
{
datetime-datetimetz
}}
\subsection
{
\class
{
datetimetz
}
Objects
\label
{
datetime-datetimetz
}}
\begin{notice}
[warning]
I think this is
\emph
{
still
}
missing some methods from the
...
...
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